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c0ffa2ba | 1 | // C++11 <type_traits> -*- C++ -*- |
af13a7a6 | 2 | |
a945c346 | 3 | // Copyright (C) 2007-2024 Free Software Foundation, Inc. |
af13a7a6 BK |
4 | // |
5 | // This file is part of the GNU ISO C++ Library. This library is free | |
6 | // software; you can redistribute it and/or modify it under the | |
7 | // terms of the GNU General Public License as published by the | |
748086b7 | 8 | // Free Software Foundation; either version 3, or (at your option) |
af13a7a6 BK |
9 | // any later version. |
10 | ||
11 | // This library is distributed in the hope that it will be useful, | |
12 | // but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | // GNU General Public License for more details. | |
15 | ||
748086b7 JJ |
16 | // Under Section 7 of GPL version 3, you are granted additional |
17 | // permissions described in the GCC Runtime Library Exception, version | |
18 | // 3.1, as published by the Free Software Foundation. | |
19 | ||
20 | // You should have received a copy of the GNU General Public License and | |
21 | // a copy of the GCC Runtime Library Exception along with this program; | |
22 | // see the files COPYING3 and COPYING.RUNTIME respectively. If not, see | |
23 | // <http://www.gnu.org/licenses/>. | |
af13a7a6 BK |
24 | |
25 | /** @file include/type_traits | |
26 | * This is a Standard C++ Library header. | |
27 | */ | |
28 | ||
4514bed6 BK |
29 | #ifndef _GLIBCXX_TYPE_TRAITS |
30 | #define _GLIBCXX_TYPE_TRAITS 1 | |
af13a7a6 BK |
31 | |
32 | #pragma GCC system_header | |
33 | ||
734f5023 | 34 | #if __cplusplus < 201103L |
ab65a4c7 | 35 | # include <bits/c++0x_warning.h> |
57317d2a | 36 | #else |
af13a7a6 | 37 | |
8fc81078 | 38 | #include <bits/c++config.h> |
e133ace8 | 39 | |
083b7f28 AA |
40 | #define __glibcxx_want_bool_constant |
41 | #define __glibcxx_want_bounded_array_traits | |
42 | #define __glibcxx_want_has_unique_object_representations | |
43 | #define __glibcxx_want_integral_constant_callable | |
44 | #define __glibcxx_want_is_aggregate | |
45 | #define __glibcxx_want_is_constant_evaluated | |
46 | #define __glibcxx_want_is_final | |
47 | #define __glibcxx_want_is_invocable | |
48 | #define __glibcxx_want_is_layout_compatible | |
49 | #define __glibcxx_want_is_nothrow_convertible | |
50 | #define __glibcxx_want_is_null_pointer | |
51 | #define __glibcxx_want_is_pointer_interconvertible | |
52 | #define __glibcxx_want_is_scoped_enum | |
53 | #define __glibcxx_want_is_swappable | |
54 | #define __glibcxx_want_logical_traits | |
55 | #define __glibcxx_want_reference_from_temporary | |
56 | #define __glibcxx_want_remove_cvref | |
57 | #define __glibcxx_want_result_of_sfinae | |
58 | #define __glibcxx_want_transformation_trait_aliases | |
59 | #define __glibcxx_want_type_identity | |
60 | #define __glibcxx_want_type_trait_variable_templates | |
61 | #define __glibcxx_want_unwrap_ref | |
62 | #define __glibcxx_want_void_t | |
63 | #include <bits/version.h> | |
64 | ||
21e2806a JW |
65 | namespace std _GLIBCXX_VISIBILITY(default) |
66 | { | |
67 | _GLIBCXX_BEGIN_NAMESPACE_VERSION | |
68 | ||
6963c3b9 JW |
69 | template<typename _Tp> |
70 | class reference_wrapper; | |
71 | ||
8e32aa11 | 72 | /** |
c0ffa2ba | 73 | * @defgroup metaprogramming Metaprogramming |
13901e4b JW |
74 | * @ingroup utilities |
75 | * | |
76 | * Template utilities for compile-time introspection and modification, | |
77 | * including type classification traits, type property inspection traits | |
78 | * and type transformation traits. | |
79 | * | |
6963c3b9 JW |
80 | * @since C++11 |
81 | * | |
5b9daa7e BK |
82 | * @{ |
83 | */ | |
ac65b7d2 DK |
84 | |
85 | /// integral_constant | |
86 | template<typename _Tp, _Tp __v> | |
87 | struct integral_constant | |
88 | { | |
067a8c7c KM |
89 | static constexpr _Tp value = __v; |
90 | using value_type = _Tp; | |
91 | using type = integral_constant<_Tp, __v>; | |
352111c5 | 92 | constexpr operator value_type() const noexcept { return value; } |
a15f7cb8 | 93 | |
083b7f28 | 94 | #ifdef __cpp_lib_integral_constant_callable // C++ >= 14 |
352111c5 | 95 | constexpr value_type operator()() const noexcept { return value; } |
db113eda | 96 | #endif |
ac65b7d2 | 97 | }; |
33ac58d5 | 98 | |
a77a46d9 | 99 | #if ! __cpp_inline_variables |
c0ffa2ba BK |
100 | template<typename _Tp, _Tp __v> |
101 | constexpr _Tp integral_constant<_Tp, __v>::value; | |
a77a46d9 | 102 | #endif |
c0ffa2ba | 103 | |
6963c3b9 JW |
104 | /// @cond undocumented |
105 | /// bool_constant for C++11 | |
f6b640be JW |
106 | template<bool __v> |
107 | using __bool_constant = integral_constant<bool, __v>; | |
6963c3b9 | 108 | /// @endcond |
f6b640be | 109 | |
066c260a KM |
110 | /// The type used as a compile-time boolean with true value. |
111 | using true_type = __bool_constant<true>; | |
112 | ||
113 | /// The type used as a compile-time boolean with false value. | |
114 | using false_type = __bool_constant<false>; | |
115 | ||
083b7f28 | 116 | #ifdef __cpp_lib_bool_constant // C++ >= 17 |
6963c3b9 JW |
117 | /// Alias template for compile-time boolean constant types. |
118 | /// @since C++17 | |
46ba1281 | 119 | template<bool __v> |
066c260a | 120 | using bool_constant = __bool_constant<__v>; |
46ba1281 JW |
121 | #endif |
122 | ||
6963c3b9 | 123 | // Metaprogramming helper types. |
53dc5044 | 124 | |
390f94ee PP |
125 | // Primary template. |
126 | /// Define a member typedef `type` only if a boolean constant is true. | |
127 | template<bool, typename _Tp = void> | |
128 | struct enable_if | |
129 | { }; | |
130 | ||
131 | // Partial specialization for true. | |
132 | template<typename _Tp> | |
133 | struct enable_if<true, _Tp> | |
067a8c7c | 134 | { using type = _Tp; }; |
390f94ee PP |
135 | |
136 | // __enable_if_t (std::enable_if_t for C++11) | |
137 | template<bool _Cond, typename _Tp = void> | |
138 | using __enable_if_t = typename enable_if<_Cond, _Tp>::type; | |
139 | ||
a09bb4a8 JW |
140 | template<bool> |
141 | struct __conditional | |
142 | { | |
143 | template<typename _Tp, typename> | |
144 | using type = _Tp; | |
145 | }; | |
146 | ||
147 | template<> | |
148 | struct __conditional<false> | |
149 | { | |
150 | template<typename, typename _Up> | |
151 | using type = _Up; | |
152 | }; | |
153 | ||
154 | // More efficient version of std::conditional_t for internal use (and C++11) | |
155 | template<bool _Cond, typename _If, typename _Else> | |
156 | using __conditional_t | |
157 | = typename __conditional<_Cond>::template type<_If, _Else>; | |
53dc5044 | 158 | |
6963c3b9 | 159 | /// @cond undocumented |
608a080c | 160 | template <typename _Type> |
0d67cd38 JW |
161 | struct __type_identity |
162 | { using type = _Type; }; | |
163 | ||
164 | template<typename _Tp> | |
165 | using __type_identity_t = typename __type_identity<_Tp>::type; | |
608a080c | 166 | |
390f94ee PP |
167 | namespace __detail |
168 | { | |
169 | // A variadic alias template that resolves to its first argument. | |
170 | template<typename _Tp, typename...> | |
171 | using __first_t = _Tp; | |
123c516a | 172 | |
390f94ee PP |
173 | // These are deliberately not defined. |
174 | template<typename... _Bn> | |
175 | auto __or_fn(int) -> __first_t<false_type, | |
176 | __enable_if_t<!bool(_Bn::value)>...>; | |
53dc5044 | 177 | |
390f94ee PP |
178 | template<typename... _Bn> |
179 | auto __or_fn(...) -> true_type; | |
53dc5044 | 180 | |
390f94ee PP |
181 | template<typename... _Bn> |
182 | auto __and_fn(int) -> __first_t<true_type, | |
183 | __enable_if_t<bool(_Bn::value)>...>; | |
ac65b7d2 | 184 | |
390f94ee PP |
185 | template<typename... _Bn> |
186 | auto __and_fn(...) -> false_type; | |
187 | } // namespace detail | |
dd7b175e | 188 | |
390f94ee PP |
189 | // Like C++17 std::dis/conjunction, but usable in C++11 and resolves |
190 | // to either true_type or false_type which allows for a more efficient | |
191 | // implementation that avoids recursive class template instantiation. | |
192 | template<typename... _Bn> | |
51c42b38 PP |
193 | struct __or_ |
194 | : decltype(__detail::__or_fn<_Bn...>(0)) | |
195 | { }; | |
123c516a | 196 | |
390f94ee | 197 | template<typename... _Bn> |
51c42b38 PP |
198 | struct __and_ |
199 | : decltype(__detail::__and_fn<_Bn...>(0)) | |
200 | { }; | |
123c516a PC |
201 | |
202 | template<typename _Pp> | |
51c42b38 PP |
203 | struct __not_ |
204 | : __bool_constant<!bool(_Pp::value)> | |
205 | { }; | |
6963c3b9 | 206 | /// @endcond |
123c516a | 207 | |
083b7f28 | 208 | #ifdef __cpp_lib_logical_traits // C++ >= 17 |
c3a6648b | 209 | |
6963c3b9 | 210 | /// @cond undocumented |
b655b8fc JW |
211 | template<typename... _Bn> |
212 | inline constexpr bool __or_v = __or_<_Bn...>::value; | |
213 | template<typename... _Bn> | |
214 | inline constexpr bool __and_v = __and_<_Bn...>::value; | |
390f94ee PP |
215 | |
216 | namespace __detail | |
217 | { | |
218 | template<typename /* = void */, typename _B1, typename... _Bn> | |
219 | struct __disjunction_impl | |
220 | { using type = _B1; }; | |
221 | ||
222 | template<typename _B1, typename _B2, typename... _Bn> | |
223 | struct __disjunction_impl<__enable_if_t<!bool(_B1::value)>, _B1, _B2, _Bn...> | |
224 | { using type = typename __disjunction_impl<void, _B2, _Bn...>::type; }; | |
225 | ||
226 | template<typename /* = void */, typename _B1, typename... _Bn> | |
227 | struct __conjunction_impl | |
228 | { using type = _B1; }; | |
229 | ||
230 | template<typename _B1, typename _B2, typename... _Bn> | |
231 | struct __conjunction_impl<__enable_if_t<bool(_B1::value)>, _B1, _B2, _Bn...> | |
232 | { using type = typename __conjunction_impl<void, _B2, _Bn...>::type; }; | |
233 | } // namespace __detail | |
6963c3b9 | 234 | /// @endcond |
b655b8fc | 235 | |
c3a6648b VV |
236 | template<typename... _Bn> |
237 | struct conjunction | |
390f94ee PP |
238 | : __detail::__conjunction_impl<void, _Bn...>::type |
239 | { }; | |
240 | ||
241 | template<> | |
242 | struct conjunction<> | |
243 | : true_type | |
c3a6648b VV |
244 | { }; |
245 | ||
246 | template<typename... _Bn> | |
247 | struct disjunction | |
390f94ee PP |
248 | : __detail::__disjunction_impl<void, _Bn...>::type |
249 | { }; | |
250 | ||
251 | template<> | |
252 | struct disjunction<> | |
253 | : false_type | |
c3a6648b VV |
254 | { }; |
255 | ||
256 | template<typename _Pp> | |
257 | struct negation | |
68c23af0 | 258 | : __not_<_Pp>::type |
c3a6648b | 259 | { }; |
137422c8 | 260 | |
6963c3b9 JW |
261 | /** @ingroup variable_templates |
262 | * @{ | |
263 | */ | |
137422c8 | 264 | template<typename... _Bn> |
4b9840f2 | 265 | inline constexpr bool conjunction_v = conjunction<_Bn...>::value; |
42183d03 | 266 | |
137422c8 | 267 | template<typename... _Bn> |
4b9840f2 | 268 | inline constexpr bool disjunction_v = disjunction<_Bn...>::value; |
42183d03 | 269 | |
137422c8 | 270 | template<typename _Pp> |
4b9840f2 | 271 | inline constexpr bool negation_v = negation<_Pp>::value; |
6963c3b9 | 272 | /// @} |
137422c8 | 273 | |
083b7f28 | 274 | #endif // __cpp_lib_logical_traits |
c3a6648b | 275 | |
608a080c AP |
276 | // Forward declarations |
277 | template<typename> | |
278 | struct is_reference; | |
279 | template<typename> | |
280 | struct is_function; | |
281 | template<typename> | |
282 | struct is_void; | |
6963c3b9 JW |
283 | template<typename> |
284 | struct remove_cv; | |
285 | template<typename> | |
286 | struct is_const; | |
287 | ||
288 | /// @cond undocumented | |
608a080c AP |
289 | template<typename> |
290 | struct __is_array_unknown_bounds; | |
291 | ||
292 | // Helper functions that return false_type for incomplete classes, | |
293 | // incomplete unions and arrays of known bound from those. | |
294 | ||
070b4df8 JW |
295 | template <typename _Tp, size_t = sizeof(_Tp)> |
296 | constexpr true_type __is_complete_or_unbounded(__type_identity<_Tp>) | |
608a080c AP |
297 | { return {}; } |
298 | ||
299 | template <typename _TypeIdentity, | |
300 | typename _NestedType = typename _TypeIdentity::type> | |
301 | constexpr typename __or_< | |
302 | is_reference<_NestedType>, | |
303 | is_function<_NestedType>, | |
304 | is_void<_NestedType>, | |
305 | __is_array_unknown_bounds<_NestedType> | |
306 | >::type __is_complete_or_unbounded(_TypeIdentity) | |
307 | { return {}; } | |
308 | ||
391d5d2e JW |
309 | // __remove_cv_t (std::remove_cv_t for C++11). |
310 | template<typename _Tp> | |
311 | using __remove_cv_t = typename remove_cv<_Tp>::type; | |
66af6e99 | 312 | /// @endcond |
391d5d2e | 313 | |
72459cfd JW |
314 | // Primary type categories. |
315 | ||
66af6e99 PP |
316 | /// is_void |
317 | template<typename _Tp> | |
318 | struct is_void | |
53dc5044 | 319 | : public false_type { }; |
53dc5044 | 320 | |
123c516a | 321 | template<> |
66af6e99 | 322 | struct is_void<void> |
123c516a | 323 | : public true_type { }; |
53dc5044 | 324 | |
66af6e99 PP |
325 | template<> |
326 | struct is_void<const void> | |
327 | : public true_type { }; | |
328 | ||
329 | template<> | |
330 | struct is_void<volatile void> | |
331 | : public true_type { }; | |
332 | ||
333 | template<> | |
334 | struct is_void<const volatile void> | |
335 | : public true_type { }; | |
53dc5044 | 336 | |
6963c3b9 | 337 | /// @cond undocumented |
53dc5044 PC |
338 | template<typename> |
339 | struct __is_integral_helper | |
340 | : public false_type { }; | |
123c516a PC |
341 | |
342 | template<> | |
343 | struct __is_integral_helper<bool> | |
344 | : public true_type { }; | |
33ac58d5 | 345 | |
123c516a PC |
346 | template<> |
347 | struct __is_integral_helper<char> | |
348 | : public true_type { }; | |
349 | ||
350 | template<> | |
351 | struct __is_integral_helper<signed char> | |
352 | : public true_type { }; | |
353 | ||
354 | template<> | |
355 | struct __is_integral_helper<unsigned char> | |
356 | : public true_type { }; | |
357 | ||
29e41848 JW |
358 | // We want is_integral<wchar_t> to be true (and make_signed/unsigned to work) |
359 | // even when libc doesn't provide working <wchar.h> and related functions, | |
4bdb9d61 | 360 | // so don't check _GLIBCXX_USE_WCHAR_T here. |
123c516a PC |
361 | template<> |
362 | struct __is_integral_helper<wchar_t> | |
363 | : public true_type { }; | |
123c516a | 364 | |
c124af93 TH |
365 | #ifdef _GLIBCXX_USE_CHAR8_T |
366 | template<> | |
367 | struct __is_integral_helper<char8_t> | |
368 | : public true_type { }; | |
369 | #endif | |
370 | ||
123c516a PC |
371 | template<> |
372 | struct __is_integral_helper<char16_t> | |
373 | : public true_type { }; | |
374 | ||
375 | template<> | |
376 | struct __is_integral_helper<char32_t> | |
377 | : public true_type { }; | |
378 | ||
379 | template<> | |
380 | struct __is_integral_helper<short> | |
381 | : public true_type { }; | |
382 | ||
383 | template<> | |
384 | struct __is_integral_helper<unsigned short> | |
385 | : public true_type { }; | |
386 | ||
387 | template<> | |
388 | struct __is_integral_helper<int> | |
389 | : public true_type { }; | |
390 | ||
391 | template<> | |
392 | struct __is_integral_helper<unsigned int> | |
393 | : public true_type { }; | |
394 | ||
395 | template<> | |
396 | struct __is_integral_helper<long> | |
397 | : public true_type { }; | |
398 | ||
399 | template<> | |
400 | struct __is_integral_helper<unsigned long> | |
401 | : public true_type { }; | |
402 | ||
403 | template<> | |
404 | struct __is_integral_helper<long long> | |
405 | : public true_type { }; | |
406 | ||
407 | template<> | |
408 | struct __is_integral_helper<unsigned long long> | |
409 | : public true_type { }; | |
53dc5044 | 410 | |
78a7c317 DD |
411 | // Conditionalizing on __STRICT_ANSI__ here will break any port that |
412 | // uses one of these types for size_t. | |
413 | #if defined(__GLIBCXX_TYPE_INT_N_0) | |
42167831 | 414 | __extension__ |
6d585f01 | 415 | template<> |
78a7c317 | 416 | struct __is_integral_helper<__GLIBCXX_TYPE_INT_N_0> |
6d585f01 PC |
417 | : public true_type { }; |
418 | ||
42167831 | 419 | __extension__ |
6d585f01 | 420 | template<> |
78a7c317 DD |
421 | struct __is_integral_helper<unsigned __GLIBCXX_TYPE_INT_N_0> |
422 | : public true_type { }; | |
423 | #endif | |
424 | #if defined(__GLIBCXX_TYPE_INT_N_1) | |
42167831 | 425 | __extension__ |
78a7c317 DD |
426 | template<> |
427 | struct __is_integral_helper<__GLIBCXX_TYPE_INT_N_1> | |
428 | : public true_type { }; | |
429 | ||
42167831 | 430 | __extension__ |
78a7c317 DD |
431 | template<> |
432 | struct __is_integral_helper<unsigned __GLIBCXX_TYPE_INT_N_1> | |
433 | : public true_type { }; | |
434 | #endif | |
435 | #if defined(__GLIBCXX_TYPE_INT_N_2) | |
42167831 | 436 | __extension__ |
78a7c317 DD |
437 | template<> |
438 | struct __is_integral_helper<__GLIBCXX_TYPE_INT_N_2> | |
439 | : public true_type { }; | |
440 | ||
42167831 | 441 | __extension__ |
78a7c317 DD |
442 | template<> |
443 | struct __is_integral_helper<unsigned __GLIBCXX_TYPE_INT_N_2> | |
444 | : public true_type { }; | |
445 | #endif | |
446 | #if defined(__GLIBCXX_TYPE_INT_N_3) | |
42167831 | 447 | __extension__ |
78a7c317 DD |
448 | template<> |
449 | struct __is_integral_helper<__GLIBCXX_TYPE_INT_N_3> | |
450 | : public true_type { }; | |
451 | ||
42167831 | 452 | __extension__ |
78a7c317 DD |
453 | template<> |
454 | struct __is_integral_helper<unsigned __GLIBCXX_TYPE_INT_N_3> | |
6d585f01 PC |
455 | : public true_type { }; |
456 | #endif | |
6963c3b9 | 457 | /// @endcond |
6d585f01 | 458 | |
53dc5044 PC |
459 | /// is_integral |
460 | template<typename _Tp> | |
461 | struct is_integral | |
391d5d2e | 462 | : public __is_integral_helper<__remove_cv_t<_Tp>>::type |
53dc5044 PC |
463 | { }; |
464 | ||
6963c3b9 | 465 | /// @cond undocumented |
53dc5044 PC |
466 | template<typename> |
467 | struct __is_floating_point_helper | |
468 | : public false_type { }; | |
123c516a PC |
469 | |
470 | template<> | |
471 | struct __is_floating_point_helper<float> | |
472 | : public true_type { }; | |
473 | ||
474 | template<> | |
475 | struct __is_floating_point_helper<double> | |
476 | : public true_type { }; | |
477 | ||
478 | template<> | |
479 | struct __is_floating_point_helper<long double> | |
480 | : public true_type { }; | |
53dc5044 | 481 | |
a23225fb JJ |
482 | #ifdef __STDCPP_FLOAT16_T__ |
483 | template<> | |
484 | struct __is_floating_point_helper<_Float16> | |
485 | : public true_type { }; | |
486 | #endif | |
487 | ||
488 | #ifdef __STDCPP_FLOAT32_T__ | |
489 | template<> | |
490 | struct __is_floating_point_helper<_Float32> | |
491 | : public true_type { }; | |
492 | #endif | |
493 | ||
494 | #ifdef __STDCPP_FLOAT64_T__ | |
495 | template<> | |
496 | struct __is_floating_point_helper<_Float64> | |
497 | : public true_type { }; | |
498 | #endif | |
499 | ||
500 | #ifdef __STDCPP_FLOAT128_T__ | |
501 | template<> | |
502 | struct __is_floating_point_helper<_Float128> | |
503 | : public true_type { }; | |
504 | #endif | |
505 | ||
506 | #ifdef __STDCPP_BFLOAT16_T__ | |
507 | template<> | |
508 | struct __is_floating_point_helper<__gnu_cxx::__bfloat16_t> | |
509 | : public true_type { }; | |
510 | #endif | |
511 | ||
6d585f01 PC |
512 | #if !defined(__STRICT_ANSI__) && defined(_GLIBCXX_USE_FLOAT128) |
513 | template<> | |
514 | struct __is_floating_point_helper<__float128> | |
515 | : public true_type { }; | |
516 | #endif | |
6963c3b9 | 517 | /// @endcond |
6d585f01 | 518 | |
53dc5044 PC |
519 | /// is_floating_point |
520 | template<typename _Tp> | |
521 | struct is_floating_point | |
391d5d2e | 522 | : public __is_floating_point_helper<__remove_cv_t<_Tp>>::type |
53dc5044 PC |
523 | { }; |
524 | ||
525 | /// is_array | |
7fd9c349 KM |
526 | #if _GLIBCXX_USE_BUILTIN_TRAIT(__is_array) |
527 | template<typename _Tp> | |
528 | struct is_array | |
529 | : public __bool_constant<__is_array(_Tp)> | |
530 | { }; | |
531 | #else | |
53dc5044 PC |
532 | template<typename> |
533 | struct is_array | |
534 | : public false_type { }; | |
535 | ||
536 | template<typename _Tp, std::size_t _Size> | |
537 | struct is_array<_Tp[_Size]> | |
538 | : public true_type { }; | |
539 | ||
540 | template<typename _Tp> | |
541 | struct is_array<_Tp[]> | |
542 | : public true_type { }; | |
7fd9c349 | 543 | #endif |
53dc5044 PC |
544 | |
545 | template<typename> | |
546 | struct __is_pointer_helper | |
547 | : public false_type { }; | |
123c516a PC |
548 | |
549 | template<typename _Tp> | |
550 | struct __is_pointer_helper<_Tp*> | |
551 | : public true_type { }; | |
53dc5044 PC |
552 | |
553 | /// is_pointer | |
554 | template<typename _Tp> | |
555 | struct is_pointer | |
391d5d2e | 556 | : public __is_pointer_helper<__remove_cv_t<_Tp>>::type |
53dc5044 PC |
557 | { }; |
558 | ||
123c516a PC |
559 | /// is_lvalue_reference |
560 | template<typename> | |
561 | struct is_lvalue_reference | |
562 | : public false_type { }; | |
563 | ||
53dc5044 | 564 | template<typename _Tp> |
123c516a PC |
565 | struct is_lvalue_reference<_Tp&> |
566 | : public true_type { }; | |
567 | ||
568 | /// is_rvalue_reference | |
569 | template<typename> | |
570 | struct is_rvalue_reference | |
571 | : public false_type { }; | |
53dc5044 | 572 | |
53dc5044 | 573 | template<typename _Tp> |
123c516a PC |
574 | struct is_rvalue_reference<_Tp&&> |
575 | : public true_type { }; | |
576 | ||
fa454b8d KM |
577 | /// is_member_object_pointer |
578 | #if _GLIBCXX_USE_BUILTIN_TRAIT(__is_member_object_pointer) | |
579 | template<typename _Tp> | |
580 | struct is_member_object_pointer | |
581 | : public __bool_constant<__is_member_object_pointer(_Tp)> | |
582 | { }; | |
583 | #else | |
53dc5044 PC |
584 | template<typename> |
585 | struct __is_member_object_pointer_helper | |
586 | : public false_type { }; | |
123c516a PC |
587 | |
588 | template<typename _Tp, typename _Cp> | |
589 | struct __is_member_object_pointer_helper<_Tp _Cp::*> | |
c01f9216 | 590 | : public __not_<is_function<_Tp>>::type { }; |
53dc5044 | 591 | |
fa454b8d | 592 | |
53dc5044 PC |
593 | template<typename _Tp> |
594 | struct is_member_object_pointer | |
391d5d2e | 595 | : public __is_member_object_pointer_helper<__remove_cv_t<_Tp>>::type |
53dc5044 | 596 | { }; |
fa454b8d | 597 | #endif |
53dc5044 | 598 | |
53f9d0cc KM |
599 | #if _GLIBCXX_USE_BUILTIN_TRAIT(__is_member_function_pointer) |
600 | /// is_member_function_pointer | |
601 | template<typename _Tp> | |
602 | struct is_member_function_pointer | |
603 | : public __bool_constant<__is_member_function_pointer(_Tp)> | |
604 | { }; | |
605 | #else | |
53dc5044 PC |
606 | template<typename> |
607 | struct __is_member_function_pointer_helper | |
608 | : public false_type { }; | |
123c516a PC |
609 | |
610 | template<typename _Tp, typename _Cp> | |
611 | struct __is_member_function_pointer_helper<_Tp _Cp::*> | |
c01f9216 | 612 | : public is_function<_Tp>::type { }; |
53dc5044 PC |
613 | |
614 | /// is_member_function_pointer | |
615 | template<typename _Tp> | |
616 | struct is_member_function_pointer | |
391d5d2e | 617 | : public __is_member_function_pointer_helper<__remove_cv_t<_Tp>>::type |
53dc5044 | 618 | { }; |
53f9d0cc | 619 | #endif |
53dc5044 PC |
620 | |
621 | /// is_enum | |
622 | template<typename _Tp> | |
623 | struct is_enum | |
637edefc | 624 | : public __bool_constant<__is_enum(_Tp)> |
53dc5044 PC |
625 | { }; |
626 | ||
627 | /// is_union | |
628 | template<typename _Tp> | |
629 | struct is_union | |
637edefc | 630 | : public __bool_constant<__is_union(_Tp)> |
53dc5044 PC |
631 | { }; |
632 | ||
633 | /// is_class | |
634 | template<typename _Tp> | |
635 | struct is_class | |
637edefc | 636 | : public __bool_constant<__is_class(_Tp)> |
53dc5044 PC |
637 | { }; |
638 | ||
639 | /// is_function | |
cdd4387c KM |
640 | #if _GLIBCXX_USE_BUILTIN_TRAIT(__is_function) |
641 | template<typename _Tp> | |
642 | struct is_function | |
643 | : public __bool_constant<__is_function(_Tp)> | |
644 | { }; | |
645 | #else | |
72459cfd | 646 | template<typename _Tp> |
53dc5044 | 647 | struct is_function |
72459cfd | 648 | : public __bool_constant<!is_const<const _Tp>::value> { }; |
89898034 | 649 | |
72459cfd JW |
650 | template<typename _Tp> |
651 | struct is_function<_Tp&> | |
652 | : public false_type { }; | |
89898034 | 653 | |
72459cfd JW |
654 | template<typename _Tp> |
655 | struct is_function<_Tp&&> | |
656 | : public false_type { }; | |
cdd4387c | 657 | #endif |
89898034 | 658 | |
083b7f28 | 659 | #ifdef __cpp_lib_is_null_pointer // C++ >= 11 |
66af6e99 PP |
660 | /// is_null_pointer (LWG 2247). |
661 | template<typename _Tp> | |
662 | struct is_null_pointer | |
1e673415 | 663 | : public false_type { }; |
123c516a PC |
664 | |
665 | template<> | |
66af6e99 | 666 | struct is_null_pointer<std::nullptr_t> |
123c516a | 667 | : public true_type { }; |
1e673415 | 668 | |
66af6e99 PP |
669 | template<> |
670 | struct is_null_pointer<const std::nullptr_t> | |
671 | : public true_type { }; | |
672 | ||
673 | template<> | |
674 | struct is_null_pointer<volatile std::nullptr_t> | |
675 | : public true_type { }; | |
676 | ||
677 | template<> | |
678 | struct is_null_pointer<const volatile std::nullptr_t> | |
679 | : public true_type { }; | |
aa940ab5 | 680 | |
07fd852f | 681 | /// __is_nullptr_t (deprecated extension). |
aba938d6 | 682 | /// @deprecated Non-standard. Use `is_null_pointer` instead. |
1e673415 PC |
683 | template<typename _Tp> |
684 | struct __is_nullptr_t | |
aa940ab5 | 685 | : public is_null_pointer<_Tp> |
eef9bf4c | 686 | { } _GLIBCXX_DEPRECATED_SUGGEST("std::is_null_pointer"); |
083b7f28 | 687 | #endif // __cpp_lib_is_null_pointer |
1e673415 | 688 | |
c0ffa2ba | 689 | // Composite type categories. |
123c516a PC |
690 | |
691 | /// is_reference | |
e86cfcae KM |
692 | #if _GLIBCXX_USE_BUILTIN_TRAIT(__is_reference) |
693 | template<typename _Tp> | |
694 | struct is_reference | |
695 | : public __bool_constant<__is_reference(_Tp)> | |
696 | { }; | |
697 | #else | |
123c516a PC |
698 | template<typename _Tp> |
699 | struct is_reference | |
cdcc27c1 PP |
700 | : public false_type |
701 | { }; | |
702 | ||
703 | template<typename _Tp> | |
704 | struct is_reference<_Tp&> | |
705 | : public true_type | |
706 | { }; | |
707 | ||
708 | template<typename _Tp> | |
709 | struct is_reference<_Tp&&> | |
710 | : public true_type | |
123c516a | 711 | { }; |
e86cfcae | 712 | #endif |
123c516a | 713 | |
53dc5044 PC |
714 | /// is_arithmetic |
715 | template<typename _Tp> | |
716 | struct is_arithmetic | |
123c516a | 717 | : public __or_<is_integral<_Tp>, is_floating_point<_Tp>>::type |
53dc5044 PC |
718 | { }; |
719 | ||
720 | /// is_fundamental | |
721 | template<typename _Tp> | |
722 | struct is_fundamental | |
aa940ab5 PC |
723 | : public __or_<is_arithmetic<_Tp>, is_void<_Tp>, |
724 | is_null_pointer<_Tp>>::type | |
53dc5044 PC |
725 | { }; |
726 | ||
727 | /// is_object | |
4b111013 KM |
728 | #if _GLIBCXX_USE_BUILTIN_TRAIT(__is_object) |
729 | template<typename _Tp> | |
730 | struct is_object | |
731 | : public __bool_constant<__is_object(_Tp)> | |
732 | { }; | |
733 | #else | |
53dc5044 PC |
734 | template<typename _Tp> |
735 | struct is_object | |
123c516a PC |
736 | : public __not_<__or_<is_function<_Tp>, is_reference<_Tp>, |
737 | is_void<_Tp>>>::type | |
53dc5044 | 738 | { }; |
4b111013 | 739 | #endif |
53dc5044 | 740 | |
123c516a | 741 | template<typename> |
53dc5044 PC |
742 | struct is_member_pointer; |
743 | ||
744 | /// is_scalar | |
745 | template<typename _Tp> | |
746 | struct is_scalar | |
123c516a | 747 | : public __or_<is_arithmetic<_Tp>, is_enum<_Tp>, is_pointer<_Tp>, |
aa940ab5 | 748 | is_member_pointer<_Tp>, is_null_pointer<_Tp>>::type |
53dc5044 PC |
749 | { }; |
750 | ||
751 | /// is_compound | |
752 | template<typename _Tp> | |
753 | struct is_compound | |
c01f9216 | 754 | : public __not_<is_fundamental<_Tp>>::type { }; |
53dc5044 | 755 | |
d95e5434 KM |
756 | /// is_member_pointer |
757 | #if _GLIBCXX_USE_BUILTIN_TRAIT(__is_member_pointer) | |
758 | template<typename _Tp> | |
759 | struct is_member_pointer | |
760 | : public __bool_constant<__is_member_pointer(_Tp)> | |
761 | { }; | |
762 | #else | |
6963c3b9 | 763 | /// @cond undocumented |
53dc5044 PC |
764 | template<typename _Tp> |
765 | struct __is_member_pointer_helper | |
766 | : public false_type { }; | |
123c516a PC |
767 | |
768 | template<typename _Tp, typename _Cp> | |
769 | struct __is_member_pointer_helper<_Tp _Cp::*> | |
770 | : public true_type { }; | |
6963c3b9 | 771 | /// @endcond |
53dc5044 PC |
772 | |
773 | template<typename _Tp> | |
123c516a | 774 | struct is_member_pointer |
391d5d2e | 775 | : public __is_member_pointer_helper<__remove_cv_t<_Tp>>::type |
53dc5044 | 776 | { }; |
d95e5434 | 777 | #endif |
53dc5044 | 778 | |
47f79054 JW |
779 | template<typename, typename> |
780 | struct is_same; | |
781 | ||
6963c3b9 | 782 | /// @cond undocumented |
47f79054 JW |
783 | template<typename _Tp, typename... _Types> |
784 | using __is_one_of = __or_<is_same<_Tp, _Types>...>; | |
785 | ||
786 | // Check if a type is one of the signed integer types. | |
42167831 | 787 | __extension__ |
47f79054 | 788 | template<typename _Tp> |
391d5d2e | 789 | using __is_signed_integer = __is_one_of<__remove_cv_t<_Tp>, |
47f79054 JW |
790 | signed char, signed short, signed int, signed long, |
791 | signed long long | |
792 | #if defined(__GLIBCXX_TYPE_INT_N_0) | |
793 | , signed __GLIBCXX_TYPE_INT_N_0 | |
794 | #endif | |
795 | #if defined(__GLIBCXX_TYPE_INT_N_1) | |
796 | , signed __GLIBCXX_TYPE_INT_N_1 | |
797 | #endif | |
798 | #if defined(__GLIBCXX_TYPE_INT_N_2) | |
799 | , signed __GLIBCXX_TYPE_INT_N_2 | |
800 | #endif | |
801 | #if defined(__GLIBCXX_TYPE_INT_N_3) | |
802 | , signed __GLIBCXX_TYPE_INT_N_3 | |
803 | #endif | |
804 | >; | |
805 | ||
806 | // Check if a type is one of the unsigned integer types. | |
42167831 | 807 | __extension__ |
47f79054 | 808 | template<typename _Tp> |
391d5d2e | 809 | using __is_unsigned_integer = __is_one_of<__remove_cv_t<_Tp>, |
47f79054 JW |
810 | unsigned char, unsigned short, unsigned int, unsigned long, |
811 | unsigned long long | |
812 | #if defined(__GLIBCXX_TYPE_INT_N_0) | |
813 | , unsigned __GLIBCXX_TYPE_INT_N_0 | |
814 | #endif | |
815 | #if defined(__GLIBCXX_TYPE_INT_N_1) | |
816 | , unsigned __GLIBCXX_TYPE_INT_N_1 | |
817 | #endif | |
818 | #if defined(__GLIBCXX_TYPE_INT_N_2) | |
819 | , unsigned __GLIBCXX_TYPE_INT_N_2 | |
820 | #endif | |
821 | #if defined(__GLIBCXX_TYPE_INT_N_3) | |
822 | , unsigned __GLIBCXX_TYPE_INT_N_3 | |
823 | #endif | |
824 | >; | |
825 | ||
98cf2c26 JW |
826 | // Check if a type is one of the signed or unsigned integer types. |
827 | template<typename _Tp> | |
828 | using __is_standard_integer | |
829 | = __or_<__is_signed_integer<_Tp>, __is_unsigned_integer<_Tp>>; | |
47f79054 | 830 | |
72459cfd JW |
831 | // __void_t (std::void_t for C++11) |
832 | template<typename...> using __void_t = void; | |
6963c3b9 | 833 | /// @endcond |
89898034 | 834 | |
c0ffa2ba | 835 | // Type properties. |
123c516a | 836 | |
53dc5044 PC |
837 | /// is_const |
838 | template<typename> | |
839 | struct is_const | |
840 | : public false_type { }; | |
841 | ||
842 | template<typename _Tp> | |
843 | struct is_const<_Tp const> | |
844 | : public true_type { }; | |
33ac58d5 | 845 | |
53dc5044 PC |
846 | /// is_volatile |
847 | template<typename> | |
848 | struct is_volatile | |
849 | : public false_type { }; | |
850 | ||
851 | template<typename _Tp> | |
852 | struct is_volatile<_Tp volatile> | |
853 | : public true_type { }; | |
854 | ||
123c516a PC |
855 | /// is_trivial |
856 | template<typename _Tp> | |
857 | struct is_trivial | |
637edefc | 858 | : public __bool_constant<__is_trivial(_Tp)> |
608a080c AP |
859 | { |
860 | static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}), | |
861 | "template argument must be a complete class or an unbounded array"); | |
862 | }; | |
123c516a | 863 | |
6963c3b9 | 864 | /// is_trivially_copyable |
f5e523b7 VV |
865 | template<typename _Tp> |
866 | struct is_trivially_copyable | |
637edefc | 867 | : public __bool_constant<__is_trivially_copyable(_Tp)> |
608a080c AP |
868 | { |
869 | static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}), | |
870 | "template argument must be a complete class or an unbounded array"); | |
871 | }; | |
123c516a PC |
872 | |
873 | /// is_standard_layout | |
874 | template<typename _Tp> | |
875 | struct is_standard_layout | |
637edefc | 876 | : public __bool_constant<__is_standard_layout(_Tp)> |
608a080c AP |
877 | { |
878 | static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}), | |
879 | "template argument must be a complete class or an unbounded array"); | |
880 | }; | |
123c516a | 881 | |
aba938d6 JW |
882 | /** is_pod |
883 | * @deprecated Deprecated in C++20. | |
884 | * Use `is_standard_layout && is_trivial` instead. | |
6963c3b9 | 885 | */ |
123c516a PC |
886 | // Could use is_standard_layout && is_trivial instead of the builtin. |
887 | template<typename _Tp> | |
1a6c5064 | 888 | struct |
4f49ae60 | 889 | _GLIBCXX20_DEPRECATED_SUGGEST("is_standard_layout && is_trivial") |
1a6c5064 | 890 | is_pod |
637edefc | 891 | : public __bool_constant<__is_pod(_Tp)> |
608a080c AP |
892 | { |
893 | static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}), | |
894 | "template argument must be a complete class or an unbounded array"); | |
895 | }; | |
123c516a | 896 | |
6963c3b9 | 897 | /** is_literal_type |
aba938d6 JW |
898 | * @deprecated Deprecated in C++17, removed in C++20. |
899 | * The idea of a literal type isn't useful. | |
6963c3b9 | 900 | */ |
123c516a | 901 | template<typename _Tp> |
24b54628 VV |
902 | struct |
903 | _GLIBCXX17_DEPRECATED | |
904 | is_literal_type | |
637edefc | 905 | : public __bool_constant<__is_literal_type(_Tp)> |
608a080c AP |
906 | { |
907 | static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}), | |
908 | "template argument must be a complete class or an unbounded array"); | |
909 | }; | |
123c516a | 910 | |
53dc5044 PC |
911 | /// is_empty |
912 | template<typename _Tp> | |
913 | struct is_empty | |
637edefc | 914 | : public __bool_constant<__is_empty(_Tp)> |
209ee624 | 915 | { }; |
53dc5044 PC |
916 | |
917 | /// is_polymorphic | |
918 | template<typename _Tp> | |
919 | struct is_polymorphic | |
637edefc | 920 | : public __bool_constant<__is_polymorphic(_Tp)> |
209ee624 | 921 | { }; |
53dc5044 | 922 | |
083b7f28 | 923 | #ifdef __cpp_lib_is_final // C++ >= 14 |
4db7fcb9 | 924 | /// is_final |
6963c3b9 | 925 | /// @since C++14 |
4db7fcb9 ESR |
926 | template<typename _Tp> |
927 | struct is_final | |
637edefc | 928 | : public __bool_constant<__is_final(_Tp)> |
209ee624 | 929 | { }; |
4db7fcb9 ESR |
930 | #endif |
931 | ||
53dc5044 PC |
932 | /// is_abstract |
933 | template<typename _Tp> | |
934 | struct is_abstract | |
637edefc | 935 | : public __bool_constant<__is_abstract(_Tp)> |
209ee624 | 936 | { }; |
53dc5044 | 937 | |
6963c3b9 | 938 | /// @cond undocumented |
123c516a | 939 | template<typename _Tp, |
6a4b1a00 | 940 | bool = is_arithmetic<_Tp>::value> |
123c516a PC |
941 | struct __is_signed_helper |
942 | : public false_type { }; | |
943 | ||
53dc5044 | 944 | template<typename _Tp> |
6a4b1a00 | 945 | struct __is_signed_helper<_Tp, true> |
637edefc | 946 | : public __bool_constant<_Tp(-1) < _Tp(0)> |
53dc5044 | 947 | { }; |
6963c3b9 | 948 | /// @endcond |
53dc5044 | 949 | |
123c516a | 950 | /// is_signed |
53dc5044 | 951 | template<typename _Tp> |
123c516a | 952 | struct is_signed |
82b12c4b | 953 | : public __is_signed_helper<_Tp>::type |
123c516a PC |
954 | { }; |
955 | ||
956 | /// is_unsigned | |
957 | template<typename _Tp> | |
958 | struct is_unsigned | |
68c23af0 | 959 | : public __and_<is_arithmetic<_Tp>, __not_<is_signed<_Tp>>>::type |
123c516a PC |
960 | { }; |
961 | ||
6963c3b9 | 962 | /// @cond undocumented |
ec26ff5a JW |
963 | template<typename _Tp, typename _Up = _Tp&&> |
964 | _Up | |
965 | __declval(int); | |
966 | ||
967 | template<typename _Tp> | |
968 | _Tp | |
969 | __declval(long); | |
6963c3b9 | 970 | /// @endcond |
ec26ff5a | 971 | |
53dc5044 | 972 | template<typename _Tp> |
ec26ff5a | 973 | auto declval() noexcept -> decltype(__declval<_Tp>(0)); |
53dc5044 | 974 | |
123c516a PC |
975 | template<typename> |
976 | struct remove_all_extents; | |
977 | ||
6963c3b9 | 978 | /// @cond undocumented |
123c516a PC |
979 | template<typename _Tp> |
980 | struct __is_array_known_bounds | |
0e1b1222 JW |
981 | : public false_type |
982 | { }; | |
983 | ||
984 | template<typename _Tp, size_t _Size> | |
985 | struct __is_array_known_bounds<_Tp[_Size]> | |
986 | : public true_type | |
53dc5044 PC |
987 | { }; |
988 | ||
123c516a PC |
989 | template<typename _Tp> |
990 | struct __is_array_unknown_bounds | |
0e1b1222 JW |
991 | : public false_type |
992 | { }; | |
993 | ||
994 | template<typename _Tp> | |
995 | struct __is_array_unknown_bounds<_Tp[]> | |
996 | : public true_type | |
53dc5044 | 997 | { }; |
33ac58d5 | 998 | |
6963c3b9 JW |
999 | // Destructible and constructible type properties. |
1000 | ||
62fa805f | 1001 | // In N3290 is_destructible does not say anything about function |
2c7a09d7 | 1002 | // types and abstract types, see LWG 2049. This implementation |
62fa805f DK |
1003 | // describes function types as non-destructible and all complete |
1004 | // object types as destructible, iff the explicit destructor | |
2c7a09d7 | 1005 | // call expression is wellformed. |
62fa805f | 1006 | struct __do_is_destructible_impl |
123c516a | 1007 | { |
62fa805f | 1008 | template<typename _Tp, typename = decltype(declval<_Tp&>().~_Tp())> |
123c516a PC |
1009 | static true_type __test(int); |
1010 | ||
1011 | template<typename> | |
1012 | static false_type __test(...); | |
1013 | }; | |
53dc5044 PC |
1014 | |
1015 | template<typename _Tp> | |
62fa805f DK |
1016 | struct __is_destructible_impl |
1017 | : public __do_is_destructible_impl | |
123c516a | 1018 | { |
067a8c7c | 1019 | using type = decltype(__test<_Tp>(0)); |
123c516a | 1020 | }; |
53dc5044 | 1021 | |
62fa805f DK |
1022 | template<typename _Tp, |
1023 | bool = __or_<is_void<_Tp>, | |
1024 | __is_array_unknown_bounds<_Tp>, | |
1025 | is_function<_Tp>>::value, | |
1026 | bool = __or_<is_reference<_Tp>, is_scalar<_Tp>>::value> | |
1027 | struct __is_destructible_safe; | |
1028 | ||
1029 | template<typename _Tp> | |
1030 | struct __is_destructible_safe<_Tp, false, false> | |
1031 | : public __is_destructible_impl<typename | |
1032 | remove_all_extents<_Tp>::type>::type | |
1033 | { }; | |
1034 | ||
1035 | template<typename _Tp> | |
1036 | struct __is_destructible_safe<_Tp, true, false> | |
1037 | : public false_type { }; | |
1038 | ||
1039 | template<typename _Tp> | |
1040 | struct __is_destructible_safe<_Tp, false, true> | |
1041 | : public true_type { }; | |
6963c3b9 | 1042 | /// @endcond |
62fa805f DK |
1043 | |
1044 | /// is_destructible | |
1045 | template<typename _Tp> | |
1046 | struct is_destructible | |
82b12c4b | 1047 | : public __is_destructible_safe<_Tp>::type |
608a080c AP |
1048 | { |
1049 | static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}), | |
1050 | "template argument must be a complete class or an unbounded array"); | |
1051 | }; | |
62fa805f | 1052 | |
6963c3b9 JW |
1053 | /// @cond undocumented |
1054 | ||
62fa805f DK |
1055 | // is_nothrow_destructible requires that is_destructible is |
1056 | // satisfied as well. We realize that by mimicing the | |
1057 | // implementation of is_destructible but refer to noexcept(expr) | |
1058 | // instead of decltype(expr). | |
1059 | struct __do_is_nt_destructible_impl | |
123c516a | 1060 | { |
62fa805f | 1061 | template<typename _Tp> |
c01f9216 JW |
1062 | static __bool_constant<noexcept(declval<_Tp&>().~_Tp())> |
1063 | __test(int); | |
123c516a PC |
1064 | |
1065 | template<typename> | |
1066 | static false_type __test(...); | |
1067 | }; | |
53dc5044 | 1068 | |
53dc5044 | 1069 | template<typename _Tp> |
62fa805f DK |
1070 | struct __is_nt_destructible_impl |
1071 | : public __do_is_nt_destructible_impl | |
123c516a | 1072 | { |
067a8c7c | 1073 | using type = decltype(__test<_Tp>(0)); |
123c516a PC |
1074 | }; |
1075 | ||
1076 | template<typename _Tp, | |
1077 | bool = __or_<is_void<_Tp>, | |
62fa805f DK |
1078 | __is_array_unknown_bounds<_Tp>, |
1079 | is_function<_Tp>>::value, | |
1080 | bool = __or_<is_reference<_Tp>, is_scalar<_Tp>>::value> | |
1081 | struct __is_nt_destructible_safe; | |
53dc5044 PC |
1082 | |
1083 | template<typename _Tp> | |
62fa805f DK |
1084 | struct __is_nt_destructible_safe<_Tp, false, false> |
1085 | : public __is_nt_destructible_impl<typename | |
1086 | remove_all_extents<_Tp>::type>::type | |
123c516a PC |
1087 | { }; |
1088 | ||
53dc5044 | 1089 | template<typename _Tp> |
62fa805f | 1090 | struct __is_nt_destructible_safe<_Tp, true, false> |
123c516a | 1091 | : public false_type { }; |
53dc5044 PC |
1092 | |
1093 | template<typename _Tp> | |
62fa805f | 1094 | struct __is_nt_destructible_safe<_Tp, false, true> |
123c516a | 1095 | : public true_type { }; |
6963c3b9 | 1096 | /// @endcond |
123c516a | 1097 | |
62fa805f | 1098 | /// is_nothrow_destructible |
53dc5044 | 1099 | template<typename _Tp> |
62fa805f | 1100 | struct is_nothrow_destructible |
82b12c4b | 1101 | : public __is_nt_destructible_safe<_Tp>::type |
608a080c AP |
1102 | { |
1103 | static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}), | |
1104 | "template argument must be a complete class or an unbounded array"); | |
1105 | }; | |
1106 | ||
6963c3b9 | 1107 | /// @cond undocumented |
608a080c | 1108 | template<typename _Tp, typename... _Args> |
9bcedbbf JW |
1109 | using __is_constructible_impl |
1110 | = __bool_constant<__is_constructible(_Tp, _Args...)>; | |
6963c3b9 | 1111 | /// @endcond |
123c516a | 1112 | |
58487c21 JW |
1113 | /// is_constructible |
1114 | template<typename _Tp, typename... _Args> | |
1115 | struct is_constructible | |
608a080c AP |
1116 | : public __is_constructible_impl<_Tp, _Args...> |
1117 | { | |
1118 | static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}), | |
1119 | "template argument must be a complete class or an unbounded array"); | |
1120 | }; | |
4a27a739 | 1121 | |
123c516a | 1122 | /// is_default_constructible |
4a27a739 | 1123 | template<typename _Tp> |
123c516a | 1124 | struct is_default_constructible |
9bcedbbf | 1125 | : public __is_constructible_impl<_Tp> |
608a080c AP |
1126 | { |
1127 | static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}), | |
1128 | "template argument must be a complete class or an unbounded array"); | |
1129 | }; | |
c32097d8 | 1130 | |
6963c3b9 | 1131 | /// @cond undocumented |
56bb34e3 | 1132 | template<typename _Tp, typename = void> |
9bcedbbf JW |
1133 | struct __add_lvalue_reference_helper |
1134 | { using type = _Tp; }; | |
123c516a | 1135 | |
65cee9bd | 1136 | template<typename _Tp> |
56bb34e3 | 1137 | struct __add_lvalue_reference_helper<_Tp, __void_t<_Tp&>> |
9bcedbbf | 1138 | { using type = _Tp&; }; |
65cee9bd PC |
1139 | |
1140 | template<typename _Tp> | |
9bcedbbf | 1141 | using __add_lval_ref_t = typename __add_lvalue_reference_helper<_Tp>::type; |
6963c3b9 | 1142 | /// @endcond |
65cee9bd PC |
1143 | |
1144 | /// is_copy_constructible | |
1145 | template<typename _Tp> | |
1146 | struct is_copy_constructible | |
9bcedbbf | 1147 | : public __is_constructible_impl<_Tp, __add_lval_ref_t<const _Tp>> |
608a080c AP |
1148 | { |
1149 | static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}), | |
1150 | "template argument must be a complete class or an unbounded array"); | |
1151 | }; | |
65cee9bd | 1152 | |
6963c3b9 | 1153 | /// @cond undocumented |
56bb34e3 | 1154 | template<typename _Tp, typename = void> |
9bcedbbf JW |
1155 | struct __add_rvalue_reference_helper |
1156 | { using type = _Tp; }; | |
65cee9bd PC |
1157 | |
1158 | template<typename _Tp> | |
56bb34e3 | 1159 | struct __add_rvalue_reference_helper<_Tp, __void_t<_Tp&&>> |
9bcedbbf | 1160 | { using type = _Tp&&; }; |
65cee9bd PC |
1161 | |
1162 | template<typename _Tp> | |
9bcedbbf | 1163 | using __add_rval_ref_t = typename __add_rvalue_reference_helper<_Tp>::type; |
6963c3b9 | 1164 | /// @endcond |
65cee9bd PC |
1165 | |
1166 | /// is_move_constructible | |
1167 | template<typename _Tp> | |
1168 | struct is_move_constructible | |
9bcedbbf | 1169 | : public __is_constructible_impl<_Tp, __add_rval_ref_t<_Tp>> |
608a080c AP |
1170 | { |
1171 | static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}), | |
1172 | "template argument must be a complete class or an unbounded array"); | |
1173 | }; | |
65cee9bd | 1174 | |
6963c3b9 | 1175 | /// @cond undocumented |
b3341826 JW |
1176 | template<typename _Tp, typename... _Args> |
1177 | using __is_nothrow_constructible_impl | |
9e2256dc | 1178 | = __bool_constant<__is_nothrow_constructible(_Tp, _Args...)>; |
6963c3b9 | 1179 | /// @endcond |
b3341826 | 1180 | |
608a080c AP |
1181 | /// is_nothrow_constructible |
1182 | template<typename _Tp, typename... _Args> | |
1183 | struct is_nothrow_constructible | |
9bcedbbf | 1184 | : public __is_nothrow_constructible_impl<_Tp, _Args...> |
608a080c AP |
1185 | { |
1186 | static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}), | |
1187 | "template argument must be a complete class or an unbounded array"); | |
1188 | }; | |
1189 | ||
b3341826 JW |
1190 | /// is_nothrow_default_constructible |
1191 | template<typename _Tp> | |
1192 | struct is_nothrow_default_constructible | |
9bcedbbf | 1193 | : public __is_nothrow_constructible_impl<_Tp> |
b3341826 JW |
1194 | { |
1195 | static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}), | |
1196 | "template argument must be a complete class or an unbounded array"); | |
1197 | }; | |
1198 | ||
65cee9bd PC |
1199 | /// is_nothrow_copy_constructible |
1200 | template<typename _Tp> | |
1201 | struct is_nothrow_copy_constructible | |
9bcedbbf | 1202 | : public __is_nothrow_constructible_impl<_Tp, __add_lval_ref_t<const _Tp>> |
608a080c AP |
1203 | { |
1204 | static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}), | |
1205 | "template argument must be a complete class or an unbounded array"); | |
1206 | }; | |
65cee9bd | 1207 | |
65cee9bd PC |
1208 | /// is_nothrow_move_constructible |
1209 | template<typename _Tp> | |
1210 | struct is_nothrow_move_constructible | |
9bcedbbf | 1211 | : public __is_nothrow_constructible_impl<_Tp, __add_rval_ref_t<_Tp>> |
608a080c AP |
1212 | { |
1213 | static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}), | |
1214 | "template argument must be a complete class or an unbounded array"); | |
1215 | }; | |
65cee9bd | 1216 | |
9bcedbbf JW |
1217 | /// @cond undocumented |
1218 | template<typename _Tp, typename _Up> | |
1219 | using __is_assignable_impl = __bool_constant<__is_assignable(_Tp, _Up)>; | |
1220 | /// @endcond | |
1221 | ||
f263981a PC |
1222 | /// is_assignable |
1223 | template<typename _Tp, typename _Up> | |
1224 | struct is_assignable | |
9bcedbbf | 1225 | : public __is_assignable_impl<_Tp, _Up> |
608a080c AP |
1226 | { |
1227 | static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}), | |
1228 | "template argument must be a complete class or an unbounded array"); | |
1229 | }; | |
f263981a | 1230 | |
f263981a PC |
1231 | /// is_copy_assignable |
1232 | template<typename _Tp> | |
1233 | struct is_copy_assignable | |
9bcedbbf JW |
1234 | : public __is_assignable_impl<__add_lval_ref_t<_Tp>, |
1235 | __add_lval_ref_t<const _Tp>> | |
608a080c AP |
1236 | { |
1237 | static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}), | |
1238 | "template argument must be a complete class or an unbounded array"); | |
1239 | }; | |
f263981a | 1240 | |
f263981a PC |
1241 | /// is_move_assignable |
1242 | template<typename _Tp> | |
1243 | struct is_move_assignable | |
9bcedbbf | 1244 | : public __is_assignable_impl<__add_lval_ref_t<_Tp>, __add_rval_ref_t<_Tp>> |
608a080c AP |
1245 | { |
1246 | static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}), | |
1247 | "template argument must be a complete class or an unbounded array"); | |
1248 | }; | |
f263981a | 1249 | |
9bcedbbf | 1250 | /// @cond undocumented |
f263981a | 1251 | template<typename _Tp, typename _Up> |
9e2256dc VV |
1252 | using __is_nothrow_assignable_impl |
1253 | = __bool_constant<__is_nothrow_assignable(_Tp, _Up)>; | |
9bcedbbf | 1254 | /// @endcond |
f263981a | 1255 | |
608a080c AP |
1256 | /// is_nothrow_assignable |
1257 | template<typename _Tp, typename _Up> | |
1258 | struct is_nothrow_assignable | |
1259 | : public __is_nothrow_assignable_impl<_Tp, _Up> | |
1260 | { | |
1261 | static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}), | |
1262 | "template argument must be a complete class or an unbounded array"); | |
1263 | }; | |
1264 | ||
f263981a PC |
1265 | /// is_nothrow_copy_assignable |
1266 | template<typename _Tp> | |
1267 | struct is_nothrow_copy_assignable | |
9bcedbbf JW |
1268 | : public __is_nothrow_assignable_impl<__add_lval_ref_t<_Tp>, |
1269 | __add_lval_ref_t<const _Tp>> | |
608a080c AP |
1270 | { |
1271 | static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}), | |
1272 | "template argument must be a complete class or an unbounded array"); | |
1273 | }; | |
f263981a | 1274 | |
f263981a | 1275 | /// is_nothrow_move_assignable |
65cee9bd | 1276 | template<typename _Tp> |
f263981a | 1277 | struct is_nothrow_move_assignable |
9bcedbbf JW |
1278 | : public __is_nothrow_assignable_impl<__add_lval_ref_t<_Tp>, |
1279 | __add_rval_ref_t<_Tp>> | |
608a080c AP |
1280 | { |
1281 | static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}), | |
1282 | "template argument must be a complete class or an unbounded array"); | |
1283 | }; | |
e4f32cb0 | 1284 | |
9bcedbbf JW |
1285 | /// @cond undocumented |
1286 | template<typename _Tp, typename... _Args> | |
1287 | using __is_trivially_constructible_impl | |
1288 | = __bool_constant<__is_trivially_constructible(_Tp, _Args...)>; | |
1289 | /// @endcond | |
1290 | ||
f5e523b7 VV |
1291 | /// is_trivially_constructible |
1292 | template<typename _Tp, typename... _Args> | |
1293 | struct is_trivially_constructible | |
9bcedbbf | 1294 | : public __is_trivially_constructible_impl<_Tp, _Args...> |
608a080c AP |
1295 | { |
1296 | static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}), | |
1297 | "template argument must be a complete class or an unbounded array"); | |
1298 | }; | |
33ac58d5 | 1299 | |
f5e523b7 VV |
1300 | /// is_trivially_default_constructible |
1301 | template<typename _Tp> | |
1302 | struct is_trivially_default_constructible | |
9bcedbbf | 1303 | : public __is_trivially_constructible_impl<_Tp> |
608a080c AP |
1304 | { |
1305 | static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}), | |
1306 | "template argument must be a complete class or an unbounded array"); | |
1307 | }; | |
6a9ecd34 | 1308 | |
f7632193 VV |
1309 | struct __do_is_implicitly_default_constructible_impl |
1310 | { | |
1311 | template <typename _Tp> | |
1312 | static void __helper(const _Tp&); | |
1313 | ||
1314 | template <typename _Tp> | |
1315 | static true_type __test(const _Tp&, | |
1316 | decltype(__helper<const _Tp&>({}))* = 0); | |
1317 | ||
1318 | static false_type __test(...); | |
1319 | }; | |
1320 | ||
1321 | template<typename _Tp> | |
1322 | struct __is_implicitly_default_constructible_impl | |
e9029d55 JW |
1323 | : public __do_is_implicitly_default_constructible_impl |
1324 | { | |
067a8c7c | 1325 | using type = decltype(__test(declval<_Tp>())); |
e9029d55 | 1326 | }; |
f7632193 VV |
1327 | |
1328 | template<typename _Tp> | |
1329 | struct __is_implicitly_default_constructible_safe | |
e9029d55 JW |
1330 | : public __is_implicitly_default_constructible_impl<_Tp>::type |
1331 | { }; | |
f7632193 VV |
1332 | |
1333 | template <typename _Tp> | |
1334 | struct __is_implicitly_default_constructible | |
608a080c | 1335 | : public __and_<__is_constructible_impl<_Tp>, |
68c23af0 | 1336 | __is_implicitly_default_constructible_safe<_Tp>>::type |
e9029d55 | 1337 | { }; |
f7632193 | 1338 | |
608a080c | 1339 | /// is_trivially_copy_constructible |
b42cc3ca VV |
1340 | template<typename _Tp> |
1341 | struct is_trivially_copy_constructible | |
9bcedbbf | 1342 | : public __is_trivially_constructible_impl<_Tp, __add_lval_ref_t<const _Tp>> |
608a080c AP |
1343 | { |
1344 | static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}), | |
1345 | "template argument must be a complete class or an unbounded array"); | |
1346 | }; | |
b42cc3ca | 1347 | |
608a080c | 1348 | /// is_trivially_move_constructible |
b42cc3ca VV |
1349 | template<typename _Tp> |
1350 | struct is_trivially_move_constructible | |
9bcedbbf | 1351 | : public __is_trivially_constructible_impl<_Tp, __add_rval_ref_t<_Tp>> |
608a080c AP |
1352 | { |
1353 | static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}), | |
1354 | "template argument must be a complete class or an unbounded array"); | |
1355 | }; | |
b42cc3ca | 1356 | |
9bcedbbf JW |
1357 | /// @cond undocumented |
1358 | template<typename _Tp, typename _Up> | |
1359 | using __is_trivially_assignable_impl | |
1360 | = __bool_constant<__is_trivially_assignable(_Tp, _Up)>; | |
1361 | /// @endcond | |
1362 | ||
f5e523b7 VV |
1363 | /// is_trivially_assignable |
1364 | template<typename _Tp, typename _Up> | |
1365 | struct is_trivially_assignable | |
9bcedbbf | 1366 | : public __is_trivially_assignable_impl<_Tp, _Up> |
608a080c AP |
1367 | { |
1368 | static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}), | |
1369 | "template argument must be a complete class or an unbounded array"); | |
1370 | }; | |
b42cc3ca | 1371 | |
608a080c | 1372 | /// is_trivially_copy_assignable |
b42cc3ca VV |
1373 | template<typename _Tp> |
1374 | struct is_trivially_copy_assignable | |
9bcedbbf JW |
1375 | : public __is_trivially_assignable_impl<__add_lval_ref_t<_Tp>, |
1376 | __add_lval_ref_t<const _Tp>> | |
608a080c AP |
1377 | { |
1378 | static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}), | |
1379 | "template argument must be a complete class or an unbounded array"); | |
1380 | }; | |
b42cc3ca | 1381 | |
608a080c | 1382 | /// is_trivially_move_assignable |
b42cc3ca VV |
1383 | template<typename _Tp> |
1384 | struct is_trivially_move_assignable | |
9bcedbbf JW |
1385 | : public __is_trivially_assignable_impl<__add_lval_ref_t<_Tp>, |
1386 | __add_rval_ref_t<_Tp>> | |
608a080c AP |
1387 | { |
1388 | static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}), | |
1389 | "template argument must be a complete class or an unbounded array"); | |
1390 | }; | |
b42cc3ca | 1391 | |
6a9ecd34 PC |
1392 | /// is_trivially_destructible |
1393 | template<typename _Tp> | |
1394 | struct is_trivially_destructible | |
608a080c | 1395 | : public __and_<__is_destructible_safe<_Tp>, |
68c23af0 | 1396 | __bool_constant<__has_trivial_destructor(_Tp)>>::type |
608a080c AP |
1397 | { |
1398 | static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}), | |
1399 | "template argument must be a complete class or an unbounded array"); | |
1400 | }; | |
6a9ecd34 | 1401 | |
e133ace8 | 1402 | |
123c516a PC |
1403 | /// has_virtual_destructor |
1404 | template<typename _Tp> | |
1405 | struct has_virtual_destructor | |
637edefc | 1406 | : public __bool_constant<__has_virtual_destructor(_Tp)> |
608a080c AP |
1407 | { |
1408 | static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}), | |
1409 | "template argument must be a complete class or an unbounded array"); | |
1410 | }; | |
123c516a | 1411 | |
33ac58d5 | 1412 | |
123c516a PC |
1413 | // type property queries. |
1414 | ||
1415 | /// alignment_of | |
1416 | template<typename _Tp> | |
1417 | struct alignment_of | |
608a080c AP |
1418 | : public integral_constant<std::size_t, alignof(_Tp)> |
1419 | { | |
1420 | static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}), | |
1421 | "template argument must be a complete class or an unbounded array"); | |
1422 | }; | |
33ac58d5 | 1423 | |
123c516a PC |
1424 | /// rank |
1425 | template<typename> | |
1426 | struct rank | |
1427 | : public integral_constant<std::size_t, 0> { }; | |
33ac58d5 | 1428 | |
123c516a PC |
1429 | template<typename _Tp, std::size_t _Size> |
1430 | struct rank<_Tp[_Size]> | |
1431 | : public integral_constant<std::size_t, 1 + rank<_Tp>::value> { }; | |
1432 | ||
1433 | template<typename _Tp> | |
1434 | struct rank<_Tp[]> | |
1435 | : public integral_constant<std::size_t, 1 + rank<_Tp>::value> { }; | |
1436 | ||
1437 | /// extent | |
0e1b1222 | 1438 | template<typename, unsigned _Uint = 0> |
123c516a | 1439 | struct extent |
0e1b1222 | 1440 | : public integral_constant<size_t, 0> { }; |
33ac58d5 | 1441 | |
0e1b1222 JW |
1442 | template<typename _Tp, size_t _Size> |
1443 | struct extent<_Tp[_Size], 0> | |
1444 | : public integral_constant<size_t, _Size> { }; | |
1445 | ||
1446 | template<typename _Tp, unsigned _Uint, size_t _Size> | |
123c516a | 1447 | struct extent<_Tp[_Size], _Uint> |
0e1b1222 JW |
1448 | : public extent<_Tp, _Uint - 1>::type { }; |
1449 | ||
1450 | template<typename _Tp> | |
1451 | struct extent<_Tp[], 0> | |
1452 | : public integral_constant<size_t, 0> { }; | |
123c516a PC |
1453 | |
1454 | template<typename _Tp, unsigned _Uint> | |
1455 | struct extent<_Tp[], _Uint> | |
0e1b1222 | 1456 | : public extent<_Tp, _Uint - 1>::type { }; |
123c516a PC |
1457 | |
1458 | ||
c0ffa2ba | 1459 | // Type relations. |
123c516a PC |
1460 | |
1461 | /// is_same | |
02f6fdff | 1462 | template<typename _Tp, typename _Up> |
123c516a | 1463 | struct is_same |
73ae6eb5 | 1464 | #ifdef _GLIBCXX_HAVE_BUILTIN_IS_SAME |
637edefc | 1465 | : public __bool_constant<__is_same(_Tp, _Up)> |
44af818f JW |
1466 | #else |
1467 | : public false_type | |
1468 | #endif | |
02f6fdff | 1469 | { }; |
b0302c68 | 1470 | |
73ae6eb5 | 1471 | #ifndef _GLIBCXX_HAVE_BUILTIN_IS_SAME |
44af818f JW |
1472 | template<typename _Tp> |
1473 | struct is_same<_Tp, _Tp> | |
1474 | : public true_type | |
1475 | { }; | |
1476 | #endif | |
1477 | ||
939759fc | 1478 | /// is_base_of |
e133ace8 PC |
1479 | template<typename _Base, typename _Derived> |
1480 | struct is_base_of | |
637edefc | 1481 | : public __bool_constant<__is_base_of(_Base, _Derived)> |
e133ace8 PC |
1482 | { }; |
1483 | ||
af85ad89 JW |
1484 | #if __has_builtin(__is_convertible) |
1485 | template<typename _From, typename _To> | |
1486 | struct is_convertible | |
1487 | : public __bool_constant<__is_convertible(_From, _To)> | |
1488 | { }; | |
1489 | #else | |
297f34d7 | 1490 | template<typename _From, typename _To, |
123c516a PC |
1491 | bool = __or_<is_void<_From>, is_function<_To>, |
1492 | is_array<_To>>::value> | |
297f34d7 | 1493 | struct __is_convertible_helper |
8df27fcb | 1494 | { |
067a8c7c | 1495 | using type = typename is_void<_To>::type; |
8df27fcb | 1496 | }; |
297f34d7 | 1497 | |
cc28d234 JW |
1498 | #pragma GCC diagnostic push |
1499 | #pragma GCC diagnostic ignored "-Wctor-dtor-privacy" | |
e133ace8 | 1500 | template<typename _From, typename _To> |
b0302c68 | 1501 | class __is_convertible_helper<_From, _To, false> |
e133ace8 | 1502 | { |
8df27fcb JW |
1503 | template<typename _To1> |
1504 | static void __test_aux(_To1) noexcept; | |
8e7d962a | 1505 | |
82b12c4b FD |
1506 | template<typename _From1, typename _To1, |
1507 | typename = decltype(__test_aux<_To1>(std::declval<_From1>()))> | |
1508 | static true_type | |
8e7d962a PC |
1509 | __test(int); |
1510 | ||
1511 | template<typename, typename> | |
82b12c4b FD |
1512 | static false_type |
1513 | __test(...); | |
297f34d7 | 1514 | |
e133ace8 | 1515 | public: |
067a8c7c | 1516 | using type = decltype(__test<_From, _To>(0)); |
e133ace8 | 1517 | }; |
cc28d234 | 1518 | #pragma GCC diagnostic pop |
82b12c4b | 1519 | |
b0302c68 | 1520 | /// is_convertible |
e133ace8 PC |
1521 | template<typename _From, typename _To> |
1522 | struct is_convertible | |
82b12c4b | 1523 | : public __is_convertible_helper<_From, _To>::type |
e133ace8 | 1524 | { }; |
af85ad89 | 1525 | #endif |
e133ace8 | 1526 | |
0302a2de JW |
1527 | // helper trait for unique_ptr<T[]>, shared_ptr<T[]>, and span<T, N> |
1528 | template<typename _ToElementType, typename _FromElementType> | |
1529 | using __is_array_convertible | |
1530 | = is_convertible<_FromElementType(*)[], _ToElementType(*)[]>; | |
1531 | ||
083b7f28 | 1532 | #ifdef __cpp_lib_is_nothrow_convertible // C++ >= 20 |
af85ad89 JW |
1533 | |
1534 | #if __has_builtin(__is_nothrow_convertible) | |
1535 | /// is_nothrow_convertible_v | |
1536 | template<typename _From, typename _To> | |
1537 | inline constexpr bool is_nothrow_convertible_v | |
1538 | = __is_nothrow_convertible(_From, _To); | |
1539 | ||
1540 | /// is_nothrow_convertible | |
1541 | template<typename _From, typename _To> | |
1542 | struct is_nothrow_convertible | |
1543 | : public bool_constant<is_nothrow_convertible_v<_From, _To>> | |
1544 | { }; | |
1545 | #else | |
608a080c | 1546 | template<typename _From, typename _To, |
ed99e818 JW |
1547 | bool = __or_<is_void<_From>, is_function<_To>, |
1548 | is_array<_To>>::value> | |
1549 | struct __is_nt_convertible_helper | |
1550 | : is_void<_To> | |
1551 | { }; | |
1552 | ||
cc28d234 JW |
1553 | #pragma GCC diagnostic push |
1554 | #pragma GCC diagnostic ignored "-Wctor-dtor-privacy" | |
ed99e818 JW |
1555 | template<typename _From, typename _To> |
1556 | class __is_nt_convertible_helper<_From, _To, false> | |
1557 | { | |
1558 | template<typename _To1> | |
1559 | static void __test_aux(_To1) noexcept; | |
1560 | ||
1561 | template<typename _From1, typename _To1> | |
ce9f305e JW |
1562 | static |
1563 | __bool_constant<noexcept(__test_aux<_To1>(std::declval<_From1>()))> | |
ed99e818 JW |
1564 | __test(int); |
1565 | ||
1566 | template<typename, typename> | |
1567 | static false_type | |
1568 | __test(...); | |
1569 | ||
1570 | public: | |
1571 | using type = decltype(__test<_From, _To>(0)); | |
1572 | }; | |
cc28d234 | 1573 | #pragma GCC diagnostic pop |
ed99e818 | 1574 | |
8df27fcb JW |
1575 | /// is_nothrow_convertible |
1576 | template<typename _From, typename _To> | |
1577 | struct is_nothrow_convertible | |
ed99e818 | 1578 | : public __is_nt_convertible_helper<_From, _To>::type |
8df27fcb JW |
1579 | { }; |
1580 | ||
1581 | /// is_nothrow_convertible_v | |
1582 | template<typename _From, typename _To> | |
1583 | inline constexpr bool is_nothrow_convertible_v | |
1584 | = is_nothrow_convertible<_From, _To>::value; | |
af85ad89 | 1585 | #endif |
083b7f28 | 1586 | #endif // __cpp_lib_is_nothrow_convertible |
fd735b6a | 1587 | |
c0ffa2ba | 1588 | // Const-volatile modifications. |
7b50cdef | 1589 | |
123c516a | 1590 | /// remove_const |
7b50cdef | 1591 | template<typename _Tp> |
123c516a | 1592 | struct remove_const |
067a8c7c | 1593 | { using type = _Tp; }; |
7b50cdef | 1594 | |
123c516a PC |
1595 | template<typename _Tp> |
1596 | struct remove_const<_Tp const> | |
067a8c7c | 1597 | { using type = _Tp; }; |
33ac58d5 | 1598 | |
123c516a PC |
1599 | /// remove_volatile |
1600 | template<typename _Tp> | |
1601 | struct remove_volatile | |
067a8c7c | 1602 | { using type = _Tp; }; |
7b50cdef | 1603 | |
123c516a PC |
1604 | template<typename _Tp> |
1605 | struct remove_volatile<_Tp volatile> | |
067a8c7c | 1606 | { using type = _Tp; }; |
33ac58d5 | 1607 | |
123c516a | 1608 | /// remove_cv |
6ddbbbff JW |
1609 | #if __has_builtin(__remove_cv) |
1610 | template<typename _Tp> | |
1611 | struct remove_cv | |
1612 | { using type = __remove_cv(_Tp); }; | |
1613 | #else | |
123c516a PC |
1614 | template<typename _Tp> |
1615 | struct remove_cv | |
391d5d2e JW |
1616 | { using type = _Tp; }; |
1617 | ||
1618 | template<typename _Tp> | |
1619 | struct remove_cv<const _Tp> | |
1620 | { using type = _Tp; }; | |
1621 | ||
1622 | template<typename _Tp> | |
1623 | struct remove_cv<volatile _Tp> | |
1624 | { using type = _Tp; }; | |
1625 | ||
1626 | template<typename _Tp> | |
1627 | struct remove_cv<const volatile _Tp> | |
1628 | { using type = _Tp; }; | |
6ddbbbff | 1629 | #endif |
33ac58d5 | 1630 | |
123c516a PC |
1631 | /// add_const |
1632 | template<typename _Tp> | |
1633 | struct add_const | |
8be17e2a | 1634 | { using type = _Tp const; }; |
33ac58d5 | 1635 | |
123c516a PC |
1636 | /// add_volatile |
1637 | template<typename _Tp> | |
1638 | struct add_volatile | |
8be17e2a | 1639 | { using type = _Tp volatile; }; |
33ac58d5 | 1640 | |
123c516a PC |
1641 | /// add_cv |
1642 | template<typename _Tp> | |
1643 | struct add_cv | |
8be17e2a | 1644 | { using type = _Tp const volatile; }; |
7b50cdef | 1645 | |
083b7f28 | 1646 | #ifdef __cpp_lib_transformation_trait_aliases // C++ >= 14 |
4457e88c JW |
1647 | /// Alias template for remove_const |
1648 | template<typename _Tp> | |
1649 | using remove_const_t = typename remove_const<_Tp>::type; | |
1650 | ||
1651 | /// Alias template for remove_volatile | |
1652 | template<typename _Tp> | |
1653 | using remove_volatile_t = typename remove_volatile<_Tp>::type; | |
1654 | ||
1655 | /// Alias template for remove_cv | |
1656 | template<typename _Tp> | |
1657 | using remove_cv_t = typename remove_cv<_Tp>::type; | |
1658 | ||
1659 | /// Alias template for add_const | |
1660 | template<typename _Tp> | |
1661 | using add_const_t = typename add_const<_Tp>::type; | |
1662 | ||
1663 | /// Alias template for add_volatile | |
1664 | template<typename _Tp> | |
1665 | using add_volatile_t = typename add_volatile<_Tp>::type; | |
1666 | ||
1667 | /// Alias template for add_cv | |
1668 | template<typename _Tp> | |
1669 | using add_cv_t = typename add_cv<_Tp>::type; | |
1670 | #endif | |
7b50cdef | 1671 | |
123c516a | 1672 | // Reference transformations. |
7b50cdef | 1673 | |
123c516a | 1674 | /// remove_reference |
6ddbbbff | 1675 | #if __has_builtin(__remove_reference) |
123c516a PC |
1676 | template<typename _Tp> |
1677 | struct remove_reference | |
6ddbbbff JW |
1678 | { using type = __remove_reference(_Tp); }; |
1679 | #else | |
1680 | template<typename _Tp> | |
1681 | struct remove_reference | |
1682 | { using type = _Tp; }; | |
7b50cdef | 1683 | |
123c516a PC |
1684 | template<typename _Tp> |
1685 | struct remove_reference<_Tp&> | |
6ddbbbff | 1686 | { using type = _Tp; }; |
7b50cdef | 1687 | |
123c516a PC |
1688 | template<typename _Tp> |
1689 | struct remove_reference<_Tp&&> | |
6ddbbbff JW |
1690 | { using type = _Tp; }; |
1691 | #endif | |
123c516a | 1692 | |
123c516a | 1693 | /// add_lvalue_reference |
5e108459 | 1694 | template<typename _Tp> |
123c516a | 1695 | struct add_lvalue_reference |
9bcedbbf | 1696 | { using type = __add_lval_ref_t<_Tp>; }; |
5e108459 | 1697 | |
123c516a | 1698 | /// add_rvalue_reference |
5e108459 | 1699 | template<typename _Tp> |
123c516a | 1700 | struct add_rvalue_reference |
9bcedbbf | 1701 | { using type = __add_rval_ref_t<_Tp>; }; |
5e108459 | 1702 | |
4457e88c JW |
1703 | #if __cplusplus > 201103L |
1704 | /// Alias template for remove_reference | |
1705 | template<typename _Tp> | |
1706 | using remove_reference_t = typename remove_reference<_Tp>::type; | |
1707 | ||
1708 | /// Alias template for add_lvalue_reference | |
1709 | template<typename _Tp> | |
1710 | using add_lvalue_reference_t = typename add_lvalue_reference<_Tp>::type; | |
1711 | ||
1712 | /// Alias template for add_rvalue_reference | |
1713 | template<typename _Tp> | |
1714 | using add_rvalue_reference_t = typename add_rvalue_reference<_Tp>::type; | |
1715 | #endif | |
7b50cdef | 1716 | |
c0ffa2ba | 1717 | // Sign modifications. |
123c516a | 1718 | |
6963c3b9 JW |
1719 | /// @cond undocumented |
1720 | ||
7b50cdef BK |
1721 | // Utility for constructing identically cv-qualified types. |
1722 | template<typename _Unqualified, bool _IsConst, bool _IsVol> | |
1723 | struct __cv_selector; | |
1724 | ||
1725 | template<typename _Unqualified> | |
1726 | struct __cv_selector<_Unqualified, false, false> | |
067a8c7c | 1727 | { using __type = _Unqualified; }; |
7b50cdef BK |
1728 | |
1729 | template<typename _Unqualified> | |
1730 | struct __cv_selector<_Unqualified, false, true> | |
067a8c7c | 1731 | { using __type = volatile _Unqualified; }; |
7b50cdef BK |
1732 | |
1733 | template<typename _Unqualified> | |
1734 | struct __cv_selector<_Unqualified, true, false> | |
067a8c7c | 1735 | { using __type = const _Unqualified; }; |
7b50cdef BK |
1736 | |
1737 | template<typename _Unqualified> | |
1738 | struct __cv_selector<_Unqualified, true, true> | |
067a8c7c | 1739 | { using __type = const volatile _Unqualified; }; |
7b50cdef BK |
1740 | |
1741 | template<typename _Qualified, typename _Unqualified, | |
1742 | bool _IsConst = is_const<_Qualified>::value, | |
1743 | bool _IsVol = is_volatile<_Qualified>::value> | |
b0302c68 | 1744 | class __match_cv_qualifiers |
7b50cdef | 1745 | { |
067a8c7c | 1746 | using __match = __cv_selector<_Unqualified, _IsConst, _IsVol>; |
7b50cdef BK |
1747 | |
1748 | public: | |
067a8c7c | 1749 | using __type = typename __match::__type; |
7b50cdef BK |
1750 | }; |
1751 | ||
7b50cdef BK |
1752 | // Utility for finding the unsigned versions of signed integral types. |
1753 | template<typename _Tp> | |
e133ace8 | 1754 | struct __make_unsigned |
067a8c7c | 1755 | { using __type = _Tp; }; |
7b50cdef BK |
1756 | |
1757 | template<> | |
1758 | struct __make_unsigned<char> | |
067a8c7c | 1759 | { using __type = unsigned char; }; |
7b50cdef BK |
1760 | |
1761 | template<> | |
1762 | struct __make_unsigned<signed char> | |
067a8c7c | 1763 | { using __type = unsigned char; }; |
7b50cdef | 1764 | |
7b50cdef BK |
1765 | template<> |
1766 | struct __make_unsigned<short> | |
067a8c7c | 1767 | { using __type = unsigned short; }; |
7b50cdef BK |
1768 | |
1769 | template<> | |
1770 | struct __make_unsigned<int> | |
067a8c7c | 1771 | { using __type = unsigned int; }; |
7b50cdef BK |
1772 | |
1773 | template<> | |
1774 | struct __make_unsigned<long> | |
067a8c7c | 1775 | { using __type = unsigned long; }; |
7b50cdef BK |
1776 | |
1777 | template<> | |
1778 | struct __make_unsigned<long long> | |
067a8c7c | 1779 | { using __type = unsigned long long; }; |
7b50cdef | 1780 | |
78a7c317 | 1781 | #if defined(__GLIBCXX_TYPE_INT_N_0) |
42167831 | 1782 | __extension__ |
78a7c317 DD |
1783 | template<> |
1784 | struct __make_unsigned<__GLIBCXX_TYPE_INT_N_0> | |
067a8c7c | 1785 | { using __type = unsigned __GLIBCXX_TYPE_INT_N_0; }; |
78a7c317 DD |
1786 | #endif |
1787 | #if defined(__GLIBCXX_TYPE_INT_N_1) | |
42167831 | 1788 | __extension__ |
78a7c317 DD |
1789 | template<> |
1790 | struct __make_unsigned<__GLIBCXX_TYPE_INT_N_1> | |
067a8c7c | 1791 | { using __type = unsigned __GLIBCXX_TYPE_INT_N_1; }; |
78a7c317 DD |
1792 | #endif |
1793 | #if defined(__GLIBCXX_TYPE_INT_N_2) | |
42167831 | 1794 | __extension__ |
6d585f01 | 1795 | template<> |
78a7c317 | 1796 | struct __make_unsigned<__GLIBCXX_TYPE_INT_N_2> |
067a8c7c | 1797 | { using __type = unsigned __GLIBCXX_TYPE_INT_N_2; }; |
78a7c317 DD |
1798 | #endif |
1799 | #if defined(__GLIBCXX_TYPE_INT_N_3) | |
42167831 | 1800 | __extension__ |
78a7c317 DD |
1801 | template<> |
1802 | struct __make_unsigned<__GLIBCXX_TYPE_INT_N_3> | |
067a8c7c | 1803 | { using __type = unsigned __GLIBCXX_TYPE_INT_N_3; }; |
6d585f01 PC |
1804 | #endif |
1805 | ||
7b50cdef | 1806 | // Select between integral and enum: not possible to be both. |
33ac58d5 | 1807 | template<typename _Tp, |
7b50cdef | 1808 | bool _IsInt = is_integral<_Tp>::value, |
ef42efe3 | 1809 | bool _IsEnum = __is_enum(_Tp)> |
b0302c68 PC |
1810 | class __make_unsigned_selector; |
1811 | ||
7b50cdef | 1812 | template<typename _Tp> |
b0302c68 | 1813 | class __make_unsigned_selector<_Tp, true, false> |
7b50cdef | 1814 | { |
22f1f4c7 | 1815 | using __unsigned_type |
391d5d2e | 1816 | = typename __make_unsigned<__remove_cv_t<_Tp>>::__type; |
7b50cdef BK |
1817 | |
1818 | public: | |
22f1f4c7 JW |
1819 | using __type |
1820 | = typename __match_cv_qualifiers<_Tp, __unsigned_type>::__type; | |
7b50cdef BK |
1821 | }; |
1822 | ||
22f1f4c7 JW |
1823 | class __make_unsigned_selector_base |
1824 | { | |
1825 | protected: | |
1826 | template<typename...> struct _List { }; | |
1827 | ||
1828 | template<typename _Tp, typename... _Up> | |
1829 | struct _List<_Tp, _Up...> : _List<_Up...> | |
1830 | { static constexpr size_t __size = sizeof(_Tp); }; | |
1831 | ||
1832 | template<size_t _Sz, typename _Tp, bool = (_Sz <= _Tp::__size)> | |
1833 | struct __select; | |
1834 | ||
1835 | template<size_t _Sz, typename _Uint, typename... _UInts> | |
1836 | struct __select<_Sz, _List<_Uint, _UInts...>, true> | |
1837 | { using __type = _Uint; }; | |
1838 | ||
1839 | template<size_t _Sz, typename _Uint, typename... _UInts> | |
1840 | struct __select<_Sz, _List<_Uint, _UInts...>, false> | |
1841 | : __select<_Sz, _List<_UInts...>> | |
1842 | { }; | |
1843 | }; | |
1844 | ||
1845 | // Choose unsigned integer type with the smallest rank and same size as _Tp | |
7b50cdef | 1846 | template<typename _Tp> |
b0302c68 | 1847 | class __make_unsigned_selector<_Tp, false, true> |
22f1f4c7 | 1848 | : __make_unsigned_selector_base |
7b50cdef | 1849 | { |
a0230468 | 1850 | // With -fshort-enums, an enum may be as small as a char. |
22f1f4c7 JW |
1851 | using _UInts = _List<unsigned char, unsigned short, unsigned int, |
1852 | unsigned long, unsigned long long>; | |
1853 | ||
1854 | using __unsigned_type = typename __select<sizeof(_Tp), _UInts>::__type; | |
73d81d3a | 1855 | |
7b50cdef | 1856 | public: |
22f1f4c7 JW |
1857 | using __type |
1858 | = typename __match_cv_qualifiers<_Tp, __unsigned_type>::__type; | |
1859 | }; | |
1860 | ||
c124af93 TH |
1861 | // wchar_t, char8_t, char16_t and char32_t are integral types but are |
1862 | // neither signed integer types nor unsigned integer types, so must be | |
22f1f4c7 JW |
1863 | // transformed to the unsigned integer type with the smallest rank. |
1864 | // Use the partial specialization for enumeration types to do that. | |
22f1f4c7 JW |
1865 | template<> |
1866 | struct __make_unsigned<wchar_t> | |
1867 | { | |
1868 | using __type | |
1869 | = typename __make_unsigned_selector<wchar_t, false, true>::__type; | |
1870 | }; | |
22f1f4c7 | 1871 | |
c124af93 TH |
1872 | #ifdef _GLIBCXX_USE_CHAR8_T |
1873 | template<> | |
1874 | struct __make_unsigned<char8_t> | |
1875 | { | |
1876 | using __type | |
1877 | = typename __make_unsigned_selector<char8_t, false, true>::__type; | |
1878 | }; | |
1879 | #endif | |
1880 | ||
22f1f4c7 JW |
1881 | template<> |
1882 | struct __make_unsigned<char16_t> | |
1883 | { | |
1884 | using __type | |
1885 | = typename __make_unsigned_selector<char16_t, false, true>::__type; | |
1886 | }; | |
1887 | ||
1888 | template<> | |
1889 | struct __make_unsigned<char32_t> | |
1890 | { | |
1891 | using __type | |
1892 | = typename __make_unsigned_selector<char32_t, false, true>::__type; | |
7b50cdef | 1893 | }; |
6963c3b9 | 1894 | /// @endcond |
7b50cdef | 1895 | |
7b50cdef BK |
1896 | // Given an integral/enum type, return the corresponding unsigned |
1897 | // integer type. | |
5b9daa7e BK |
1898 | // Primary template. |
1899 | /// make_unsigned | |
7b50cdef | 1900 | template<typename _Tp> |
33ac58d5 | 1901 | struct make_unsigned |
067a8c7c | 1902 | { using type = typename __make_unsigned_selector<_Tp>::__type; }; |
7b50cdef BK |
1903 | |
1904 | // Integral, but don't define. | |
2bd112de JW |
1905 | template<> struct make_unsigned<bool>; |
1906 | template<> struct make_unsigned<bool const>; | |
1907 | template<> struct make_unsigned<bool volatile>; | |
1908 | template<> struct make_unsigned<bool const volatile>; | |
7b50cdef | 1909 | |
6963c3b9 | 1910 | /// @cond undocumented |
7b50cdef BK |
1911 | |
1912 | // Utility for finding the signed versions of unsigned integral types. | |
1913 | template<typename _Tp> | |
e133ace8 | 1914 | struct __make_signed |
067a8c7c | 1915 | { using __type = _Tp; }; |
7b50cdef BK |
1916 | |
1917 | template<> | |
1918 | struct __make_signed<char> | |
067a8c7c | 1919 | { using __type = signed char; }; |
7b50cdef BK |
1920 | |
1921 | template<> | |
1922 | struct __make_signed<unsigned char> | |
067a8c7c | 1923 | { using __type = signed char; }; |
7b50cdef | 1924 | |
7b50cdef BK |
1925 | template<> |
1926 | struct __make_signed<unsigned short> | |
067a8c7c | 1927 | { using __type = signed short; }; |
7b50cdef BK |
1928 | |
1929 | template<> | |
1930 | struct __make_signed<unsigned int> | |
067a8c7c | 1931 | { using __type = signed int; }; |
7b50cdef BK |
1932 | |
1933 | template<> | |
1934 | struct __make_signed<unsigned long> | |
067a8c7c | 1935 | { using __type = signed long; }; |
7b50cdef BK |
1936 | |
1937 | template<> | |
1938 | struct __make_signed<unsigned long long> | |
067a8c7c | 1939 | { using __type = signed long long; }; |
7b50cdef | 1940 | |
78a7c317 | 1941 | #if defined(__GLIBCXX_TYPE_INT_N_0) |
42167831 | 1942 | __extension__ |
78a7c317 DD |
1943 | template<> |
1944 | struct __make_signed<unsigned __GLIBCXX_TYPE_INT_N_0> | |
067a8c7c | 1945 | { using __type = __GLIBCXX_TYPE_INT_N_0; }; |
78a7c317 DD |
1946 | #endif |
1947 | #if defined(__GLIBCXX_TYPE_INT_N_1) | |
42167831 | 1948 | __extension__ |
78a7c317 DD |
1949 | template<> |
1950 | struct __make_signed<unsigned __GLIBCXX_TYPE_INT_N_1> | |
067a8c7c | 1951 | { using __type = __GLIBCXX_TYPE_INT_N_1; }; |
78a7c317 DD |
1952 | #endif |
1953 | #if defined(__GLIBCXX_TYPE_INT_N_2) | |
42167831 | 1954 | __extension__ |
78a7c317 DD |
1955 | template<> |
1956 | struct __make_signed<unsigned __GLIBCXX_TYPE_INT_N_2> | |
067a8c7c | 1957 | { using __type = __GLIBCXX_TYPE_INT_N_2; }; |
78a7c317 DD |
1958 | #endif |
1959 | #if defined(__GLIBCXX_TYPE_INT_N_3) | |
42167831 | 1960 | __extension__ |
6d585f01 | 1961 | template<> |
78a7c317 | 1962 | struct __make_signed<unsigned __GLIBCXX_TYPE_INT_N_3> |
067a8c7c | 1963 | { using __type = __GLIBCXX_TYPE_INT_N_3; }; |
6d585f01 PC |
1964 | #endif |
1965 | ||
fb8ffd10 | 1966 | // Select between integral and enum: not possible to be both. |
33ac58d5 | 1967 | template<typename _Tp, |
7b50cdef | 1968 | bool _IsInt = is_integral<_Tp>::value, |
ef42efe3 | 1969 | bool _IsEnum = __is_enum(_Tp)> |
b0302c68 PC |
1970 | class __make_signed_selector; |
1971 | ||
7b50cdef | 1972 | template<typename _Tp> |
b0302c68 | 1973 | class __make_signed_selector<_Tp, true, false> |
7b50cdef | 1974 | { |
22f1f4c7 | 1975 | using __signed_type |
391d5d2e | 1976 | = typename __make_signed<__remove_cv_t<_Tp>>::__type; |
7b50cdef BK |
1977 | |
1978 | public: | |
22f1f4c7 JW |
1979 | using __type |
1980 | = typename __match_cv_qualifiers<_Tp, __signed_type>::__type; | |
7b50cdef BK |
1981 | }; |
1982 | ||
22f1f4c7 | 1983 | // Choose signed integer type with the smallest rank and same size as _Tp |
7b50cdef | 1984 | template<typename _Tp> |
b0302c68 | 1985 | class __make_signed_selector<_Tp, false, true> |
7b50cdef | 1986 | { |
067a8c7c | 1987 | using __unsigned_type = typename __make_unsigned_selector<_Tp>::__type; |
7b50cdef BK |
1988 | |
1989 | public: | |
067a8c7c | 1990 | using __type = typename __make_signed_selector<__unsigned_type>::__type; |
7b50cdef BK |
1991 | }; |
1992 | ||
22f1f4c7 | 1993 | // wchar_t, char16_t and char32_t are integral types but are neither |
d4b695e4 | 1994 | // signed integer types nor unsigned integer types, so must be |
22f1f4c7 JW |
1995 | // transformed to the signed integer type with the smallest rank. |
1996 | // Use the partial specialization for enumeration types to do that. | |
22f1f4c7 JW |
1997 | template<> |
1998 | struct __make_signed<wchar_t> | |
1999 | { | |
2000 | using __type | |
2001 | = typename __make_signed_selector<wchar_t, false, true>::__type; | |
2002 | }; | |
22f1f4c7 | 2003 | |
c124af93 TH |
2004 | #if defined(_GLIBCXX_USE_CHAR8_T) |
2005 | template<> | |
2006 | struct __make_signed<char8_t> | |
2007 | { | |
2008 | using __type | |
2009 | = typename __make_signed_selector<char8_t, false, true>::__type; | |
2010 | }; | |
2011 | #endif | |
2012 | ||
22f1f4c7 JW |
2013 | template<> |
2014 | struct __make_signed<char16_t> | |
2015 | { | |
2016 | using __type | |
2017 | = typename __make_signed_selector<char16_t, false, true>::__type; | |
2018 | }; | |
2019 | ||
2020 | template<> | |
2021 | struct __make_signed<char32_t> | |
2022 | { | |
2023 | using __type | |
2024 | = typename __make_signed_selector<char32_t, false, true>::__type; | |
2025 | }; | |
6963c3b9 | 2026 | /// @endcond |
22f1f4c7 | 2027 | |
7b50cdef BK |
2028 | // Given an integral/enum type, return the corresponding signed |
2029 | // integer type. | |
5b9daa7e BK |
2030 | // Primary template. |
2031 | /// make_signed | |
7b50cdef | 2032 | template<typename _Tp> |
33ac58d5 | 2033 | struct make_signed |
067a8c7c | 2034 | { using type = typename __make_signed_selector<_Tp>::__type; }; |
7b50cdef BK |
2035 | |
2036 | // Integral, but don't define. | |
2bd112de JW |
2037 | template<> struct make_signed<bool>; |
2038 | template<> struct make_signed<bool const>; | |
2039 | template<> struct make_signed<bool volatile>; | |
2040 | template<> struct make_signed<bool const volatile>; | |
cfa9a96b | 2041 | |
4457e88c JW |
2042 | #if __cplusplus > 201103L |
2043 | /// Alias template for make_signed | |
2044 | template<typename _Tp> | |
2045 | using make_signed_t = typename make_signed<_Tp>::type; | |
2046 | ||
2047 | /// Alias template for make_unsigned | |
2048 | template<typename _Tp> | |
2049 | using make_unsigned_t = typename make_unsigned<_Tp>::type; | |
2050 | #endif | |
123c516a | 2051 | |
c0ffa2ba | 2052 | // Array modifications. |
123c516a PC |
2053 | |
2054 | /// remove_extent | |
2055 | template<typename _Tp> | |
2056 | struct remove_extent | |
067a8c7c | 2057 | { using type = _Tp; }; |
123c516a PC |
2058 | |
2059 | template<typename _Tp, std::size_t _Size> | |
2060 | struct remove_extent<_Tp[_Size]> | |
067a8c7c | 2061 | { using type = _Tp; }; |
123c516a PC |
2062 | |
2063 | template<typename _Tp> | |
2064 | struct remove_extent<_Tp[]> | |
067a8c7c | 2065 | { using type = _Tp; }; |
123c516a PC |
2066 | |
2067 | /// remove_all_extents | |
2068 | template<typename _Tp> | |
2069 | struct remove_all_extents | |
067a8c7c | 2070 | { using type = _Tp; }; |
123c516a PC |
2071 | |
2072 | template<typename _Tp, std::size_t _Size> | |
2073 | struct remove_all_extents<_Tp[_Size]> | |
067a8c7c | 2074 | { using type = typename remove_all_extents<_Tp>::type; }; |
123c516a PC |
2075 | |
2076 | template<typename _Tp> | |
2077 | struct remove_all_extents<_Tp[]> | |
067a8c7c | 2078 | { using type = typename remove_all_extents<_Tp>::type; }; |
123c516a | 2079 | |
4457e88c JW |
2080 | #if __cplusplus > 201103L |
2081 | /// Alias template for remove_extent | |
2082 | template<typename _Tp> | |
2083 | using remove_extent_t = typename remove_extent<_Tp>::type; | |
2084 | ||
2085 | /// Alias template for remove_all_extents | |
2086 | template<typename _Tp> | |
2087 | using remove_all_extents_t = typename remove_all_extents<_Tp>::type; | |
2088 | #endif | |
123c516a | 2089 | |
c0ffa2ba | 2090 | // Pointer modifications. |
123c516a | 2091 | |
61d6dee9 KM |
2092 | /// remove_pointer |
2093 | #if _GLIBCXX_USE_BUILTIN_TRAIT(__remove_pointer) | |
2094 | template<typename _Tp> | |
2095 | struct remove_pointer | |
2096 | { using type = __remove_pointer(_Tp); }; | |
2097 | #else | |
123c516a PC |
2098 | template<typename _Tp, typename> |
2099 | struct __remove_pointer_helper | |
067a8c7c | 2100 | { using type = _Tp; }; |
123c516a PC |
2101 | |
2102 | template<typename _Tp, typename _Up> | |
2103 | struct __remove_pointer_helper<_Tp, _Up*> | |
067a8c7c | 2104 | { using type = _Up; }; |
123c516a | 2105 | |
123c516a PC |
2106 | template<typename _Tp> |
2107 | struct remove_pointer | |
391d5d2e | 2108 | : public __remove_pointer_helper<_Tp, __remove_cv_t<_Tp>> |
123c516a | 2109 | { }; |
61d6dee9 | 2110 | #endif |
123c516a | 2111 | |
56bb34e3 | 2112 | template<typename _Tp, typename = void> |
89898034 | 2113 | struct __add_pointer_helper |
56bb34e3 | 2114 | { using type = _Tp; }; |
89898034 | 2115 | |
123c516a | 2116 | template<typename _Tp> |
56bb34e3 JW |
2117 | struct __add_pointer_helper<_Tp, __void_t<_Tp*>> |
2118 | { using type = _Tp*; }; | |
123c516a | 2119 | |
6963c3b9 | 2120 | /// add_pointer |
89898034 | 2121 | template<typename _Tp> |
33ac58d5 | 2122 | struct add_pointer |
89898034 DK |
2123 | : public __add_pointer_helper<_Tp> |
2124 | { }; | |
2125 | ||
56bb34e3 JW |
2126 | template<typename _Tp> |
2127 | struct add_pointer<_Tp&> | |
2128 | { using type = _Tp*; }; | |
2129 | ||
2130 | template<typename _Tp> | |
2131 | struct add_pointer<_Tp&&> | |
2132 | { using type = _Tp*; }; | |
2133 | ||
4457e88c JW |
2134 | #if __cplusplus > 201103L |
2135 | /// Alias template for remove_pointer | |
2136 | template<typename _Tp> | |
2137 | using remove_pointer_t = typename remove_pointer<_Tp>::type; | |
2138 | ||
2139 | /// Alias template for add_pointer | |
2140 | template<typename _Tp> | |
2141 | using add_pointer_t = typename add_pointer<_Tp>::type; | |
2142 | #endif | |
123c516a PC |
2143 | |
2144 | template<std::size_t _Len> | |
2145 | struct __aligned_storage_msa | |
33ac58d5 | 2146 | { |
123c516a PC |
2147 | union __type |
2148 | { | |
2149 | unsigned char __data[_Len]; | |
33ac58d5 | 2150 | struct __attribute__((__aligned__)) { } __align; |
123c516a PC |
2151 | }; |
2152 | }; | |
2153 | ||
2154 | /** | |
2155 | * @brief Alignment type. | |
2156 | * | |
2157 | * The value of _Align is a default-alignment which shall be the | |
2158 | * most stringent alignment requirement for any C++ object type | |
2159 | * whose size is no greater than _Len (3.9). The member typedef | |
2160 | * type shall be a POD type suitable for use as uninitialized | |
2161 | * storage for any object whose size is at most _Len and whose | |
2162 | * alignment is a divisor of _Align. | |
aa02a69e NS |
2163 | * |
2164 | * @deprecated Deprecated in C++23. Uses can be replaced by an | |
2165 | * array std::byte[_Len] declared with alignas(_Align). | |
123c516a PC |
2166 | */ |
2167 | template<std::size_t _Len, std::size_t _Align = | |
2168 | __alignof__(typename __aligned_storage_msa<_Len>::__type)> | |
aa02a69e NS |
2169 | struct |
2170 | _GLIBCXX23_DEPRECATED | |
2171 | aligned_storage | |
33ac58d5 | 2172 | { |
123c516a PC |
2173 | union type |
2174 | { | |
2175 | unsigned char __data[_Len]; | |
33ac58d5 | 2176 | struct __attribute__((__aligned__((_Align)))) { } __align; |
123c516a PC |
2177 | }; |
2178 | }; | |
2179 | ||
d3718027 RS |
2180 | template <typename... _Types> |
2181 | struct __strictest_alignment | |
2182 | { | |
2183 | static const size_t _S_alignment = 0; | |
2184 | static const size_t _S_size = 0; | |
2185 | }; | |
2186 | ||
2187 | template <typename _Tp, typename... _Types> | |
2188 | struct __strictest_alignment<_Tp, _Types...> | |
2189 | { | |
2190 | static const size_t _S_alignment = | |
2191 | alignof(_Tp) > __strictest_alignment<_Types...>::_S_alignment | |
2192 | ? alignof(_Tp) : __strictest_alignment<_Types...>::_S_alignment; | |
2193 | static const size_t _S_size = | |
2194 | sizeof(_Tp) > __strictest_alignment<_Types...>::_S_size | |
2195 | ? sizeof(_Tp) : __strictest_alignment<_Types...>::_S_size; | |
2196 | }; | |
2197 | ||
c76f55bf JW |
2198 | #pragma GCC diagnostic push |
2199 | #pragma GCC diagnostic ignored "-Wdeprecated-declarations" | |
2200 | ||
d3718027 RS |
2201 | /** |
2202 | * @brief Provide aligned storage for types. | |
2203 | * | |
2204 | * [meta.trans.other] | |
2205 | * | |
2206 | * Provides aligned storage for any of the provided types of at | |
2207 | * least size _Len. | |
2208 | * | |
2209 | * @see aligned_storage | |
aa02a69e NS |
2210 | * |
2211 | * @deprecated Deprecated in C++23. | |
d3718027 RS |
2212 | */ |
2213 | template <size_t _Len, typename... _Types> | |
aa02a69e NS |
2214 | struct |
2215 | _GLIBCXX23_DEPRECATED | |
2216 | aligned_union | |
d3718027 RS |
2217 | { |
2218 | private: | |
2219 | static_assert(sizeof...(_Types) != 0, "At least one type is required"); | |
2220 | ||
2221 | using __strictest = __strictest_alignment<_Types...>; | |
2222 | static const size_t _S_len = _Len > __strictest::_S_size | |
2223 | ? _Len : __strictest::_S_size; | |
2224 | public: | |
2225 | /// The value of the strictest alignment of _Types. | |
2226 | static const size_t alignment_value = __strictest::_S_alignment; | |
2227 | /// The storage. | |
067a8c7c | 2228 | using type = typename aligned_storage<_S_len, alignment_value>::type; |
d3718027 RS |
2229 | }; |
2230 | ||
2231 | template <size_t _Len, typename... _Types> | |
2232 | const size_t aligned_union<_Len, _Types...>::alignment_value; | |
c76f55bf | 2233 | #pragma GCC diagnostic pop |
123c516a | 2234 | |
6963c3b9 JW |
2235 | /// @cond undocumented |
2236 | ||
123c516a PC |
2237 | // Decay trait for arrays and functions, used for perfect forwarding |
2238 | // in make_pair, make_tuple, etc. | |
33ac58d5 | 2239 | template<typename _Up> |
775fe01b JW |
2240 | struct __decay_selector |
2241 | : __conditional_t<is_const<const _Up>::value, // false for functions | |
2242 | remove_cv<_Up>, // N.B. DR 705. | |
2243 | add_pointer<_Up>> // function decays to pointer | |
2244 | { }; | |
123c516a | 2245 | |
775fe01b JW |
2246 | template<typename _Up, size_t _Nm> |
2247 | struct __decay_selector<_Up[_Nm]> | |
2248 | { using type = _Up*; }; | |
123c516a | 2249 | |
33ac58d5 | 2250 | template<typename _Up> |
775fe01b JW |
2251 | struct __decay_selector<_Up[]> |
2252 | { using type = _Up*; }; | |
2253 | ||
6963c3b9 | 2254 | /// @endcond |
123c516a PC |
2255 | |
2256 | /// decay | |
33ac58d5 | 2257 | template<typename _Tp> |
775fe01b JW |
2258 | struct decay |
2259 | { using type = typename __decay_selector<_Tp>::type; }; | |
123c516a | 2260 | |
775fe01b JW |
2261 | template<typename _Tp> |
2262 | struct decay<_Tp&> | |
2263 | { using type = typename __decay_selector<_Tp>::type; }; | |
2264 | ||
2265 | template<typename _Tp> | |
2266 | struct decay<_Tp&&> | |
2267 | { using type = typename __decay_selector<_Tp>::type; }; | |
123c516a | 2268 | |
6963c3b9 | 2269 | /// @cond undocumented |
123c516a PC |
2270 | |
2271 | // Helper which adds a reference to a type when given a reference_wrapper | |
2272 | template<typename _Tp> | |
2273 | struct __strip_reference_wrapper | |
2274 | { | |
067a8c7c | 2275 | using __type = _Tp; |
123c516a PC |
2276 | }; |
2277 | ||
2278 | template<typename _Tp> | |
2279 | struct __strip_reference_wrapper<reference_wrapper<_Tp> > | |
2280 | { | |
067a8c7c | 2281 | using __type = _Tp&; |
123c516a PC |
2282 | }; |
2283 | ||
6963c3b9 | 2284 | // __decay_t (std::decay_t for C++11). |
123c516a | 2285 | template<typename _Tp> |
6963c3b9 | 2286 | using __decay_t = typename decay<_Tp>::type; |
123c516a | 2287 | |
6963c3b9 JW |
2288 | template<typename _Tp> |
2289 | using __decay_and_strip = __strip_reference_wrapper<__decay_t<_Tp>>; | |
2290 | /// @endcond | |
123c516a | 2291 | |
6963c3b9 JW |
2292 | /// @cond undocumented |
2293 | ||
6963c3b9 | 2294 | // Helper for SFINAE constraints |
23df8534 | 2295 | template<typename... _Cond> |
391d5d2e | 2296 | using _Require = __enable_if_t<__and_<_Cond...>::value>; |
123c516a | 2297 | |
6963c3b9 JW |
2298 | // __remove_cvref_t (std::remove_cvref_t for C++11). |
2299 | template<typename _Tp> | |
2300 | using __remove_cvref_t | |
2301 | = typename remove_cv<typename remove_reference<_Tp>::type>::type; | |
2302 | /// @endcond | |
2303 | ||
123c516a | 2304 | // Primary template. |
13901e4b | 2305 | /// Define a member typedef @c type to one of two argument types. |
123c516a PC |
2306 | template<bool _Cond, typename _Iftrue, typename _Iffalse> |
2307 | struct conditional | |
067a8c7c | 2308 | { using type = _Iftrue; }; |
123c516a PC |
2309 | |
2310 | // Partial specialization for false. | |
2311 | template<typename _Iftrue, typename _Iffalse> | |
2312 | struct conditional<false, _Iftrue, _Iffalse> | |
067a8c7c | 2313 | { using type = _Iffalse; }; |
123c516a | 2314 | |
5b9daa7e | 2315 | /// common_type |
cfa9a96b CF |
2316 | template<typename... _Tp> |
2317 | struct common_type; | |
2318 | ||
c0ffa2ba | 2319 | // Sfinae-friendly common_type implementation: |
b3618b71 | 2320 | |
6963c3b9 | 2321 | /// @cond undocumented |
8492f7dd JW |
2322 | |
2323 | // For several sfinae-friendly trait implementations we transport both the | |
2324 | // result information (as the member type) and the failure information (no | |
2325 | // member type). This is very similar to std::enable_if, but we cannot use | |
2326 | // that, because we need to derive from them as an implementation detail. | |
2327 | ||
2328 | template<typename _Tp> | |
2329 | struct __success_type | |
067a8c7c | 2330 | { using type = _Tp; }; |
8492f7dd JW |
2331 | |
2332 | struct __failure_type | |
2333 | { }; | |
2334 | ||
b3618b71 DK |
2335 | struct __do_common_type_impl |
2336 | { | |
2337 | template<typename _Tp, typename _Up> | |
f61a12b3 JW |
2338 | using __cond_t |
2339 | = decltype(true ? std::declval<_Tp>() : std::declval<_Up>()); | |
2340 | ||
0f8b14ee JW |
2341 | // if decay_t<decltype(false ? declval<D1>() : declval<D2>())> |
2342 | // denotes a valid type, let C denote that type. | |
f61a12b3 | 2343 | template<typename _Tp, typename _Up> |
0f8b14ee | 2344 | static __success_type<__decay_t<__cond_t<_Tp, _Up>>> |
f61a12b3 | 2345 | _S_test(int); |
b3618b71 | 2346 | |
0f8b14ee JW |
2347 | #if __cplusplus > 201703L |
2348 | // Otherwise, if COND-RES(CREF(D1), CREF(D2)) denotes a type, | |
2349 | // let C denote the type decay_t<COND-RES(CREF(D1), CREF(D2))>. | |
2350 | template<typename _Tp, typename _Up> | |
2351 | static __success_type<__remove_cvref_t<__cond_t<const _Tp&, const _Up&>>> | |
2352 | _S_test_2(int); | |
2353 | #endif | |
2354 | ||
b3618b71 | 2355 | template<typename, typename> |
f61a12b3 | 2356 | static __failure_type |
0f8b14ee JW |
2357 | _S_test_2(...); |
2358 | ||
2359 | template<typename _Tp, typename _Up> | |
2360 | static decltype(_S_test_2<_Tp, _Up>(0)) | |
f61a12b3 | 2361 | _S_test(...); |
b3618b71 DK |
2362 | }; |
2363 | ||
f61a12b3 JW |
2364 | // If sizeof...(T) is zero, there shall be no member type. |
2365 | template<> | |
2366 | struct common_type<> | |
2367 | { }; | |
b3618b71 | 2368 | |
f61a12b3 JW |
2369 | // If sizeof...(T) is one, the same type, if any, as common_type_t<T0, T0>. |
2370 | template<typename _Tp0> | |
2371 | struct common_type<_Tp0> | |
2372 | : public common_type<_Tp0, _Tp0> | |
2373 | { }; | |
b3618b71 | 2374 | |
f61a12b3 JW |
2375 | // If sizeof...(T) is two, ... |
2376 | template<typename _Tp1, typename _Tp2, | |
391d5d2e | 2377 | typename _Dp1 = __decay_t<_Tp1>, typename _Dp2 = __decay_t<_Tp2>> |
f61a12b3 | 2378 | struct __common_type_impl |
b3618b71 | 2379 | { |
f61a12b3 JW |
2380 | // If is_same_v<T1, D1> is false or is_same_v<T2, D2> is false, |
2381 | // let C denote the same type, if any, as common_type_t<D1, D2>. | |
2382 | using type = common_type<_Dp1, _Dp2>; | |
b3618b71 DK |
2383 | }; |
2384 | ||
f61a12b3 JW |
2385 | template<typename _Tp1, typename _Tp2> |
2386 | struct __common_type_impl<_Tp1, _Tp2, _Tp1, _Tp2> | |
2387 | : private __do_common_type_impl | |
b3618b71 | 2388 | { |
f61a12b3 JW |
2389 | // Otherwise, if decay_t<decltype(false ? declval<D1>() : declval<D2>())> |
2390 | // denotes a valid type, let C denote that type. | |
2391 | using type = decltype(_S_test<_Tp1, _Tp2>(0)); | |
b3618b71 DK |
2392 | }; |
2393 | ||
f61a12b3 JW |
2394 | // If sizeof...(T) is two, ... |
2395 | template<typename _Tp1, typename _Tp2> | |
2396 | struct common_type<_Tp1, _Tp2> | |
2397 | : public __common_type_impl<_Tp1, _Tp2>::type | |
2398 | { }; | |
b3618b71 | 2399 | |
f61a12b3 JW |
2400 | template<typename...> |
2401 | struct __common_type_pack | |
373c726e JW |
2402 | { }; |
2403 | ||
f61a12b3 JW |
2404 | template<typename, typename, typename = void> |
2405 | struct __common_type_fold; | |
2406 | ||
2407 | // If sizeof...(T) is greater than two, ... | |
2408 | template<typename _Tp1, typename _Tp2, typename... _Rp> | |
2409 | struct common_type<_Tp1, _Tp2, _Rp...> | |
2410 | : public __common_type_fold<common_type<_Tp1, _Tp2>, | |
2411 | __common_type_pack<_Rp...>> | |
373c726e | 2412 | { }; |
cfa9a96b | 2413 | |
f61a12b3 JW |
2414 | // Let C denote the same type, if any, as common_type_t<T1, T2>. |
2415 | // If there is such a type C, type shall denote the same type, if any, | |
2416 | // as common_type_t<C, R...>. | |
2417 | template<typename _CTp, typename... _Rp> | |
2418 | struct __common_type_fold<_CTp, __common_type_pack<_Rp...>, | |
2419 | __void_t<typename _CTp::type>> | |
2420 | : public common_type<typename _CTp::type, _Rp...> | |
b3618b71 | 2421 | { }; |
cfa9a96b | 2422 | |
f61a12b3 JW |
2423 | // Otherwise, there shall be no member type. |
2424 | template<typename _CTp, typename _Rp> | |
2425 | struct __common_type_fold<_CTp, _Rp, void> | |
b3618b71 | 2426 | { }; |
7274deff | 2427 | |
ef42efe3 | 2428 | template<typename _Tp, bool = __is_enum(_Tp)> |
3c26b759 JW |
2429 | struct __underlying_type_impl |
2430 | { | |
2431 | using type = __underlying_type(_Tp); | |
2432 | }; | |
2433 | ||
2434 | template<typename _Tp> | |
2435 | struct __underlying_type_impl<_Tp, false> | |
2436 | { }; | |
6963c3b9 | 2437 | /// @endcond |
3c26b759 | 2438 | |
13901e4b | 2439 | /// The underlying type of an enum. |
a47407f6 PC |
2440 | template<typename _Tp> |
2441 | struct underlying_type | |
3c26b759 JW |
2442 | : public __underlying_type_impl<_Tp> |
2443 | { }; | |
123c516a | 2444 | |
6963c3b9 | 2445 | /// @cond undocumented |
7274deff PC |
2446 | template<typename _Tp> |
2447 | struct __declval_protector | |
2448 | { | |
2449 | static const bool __stop = false; | |
7274deff | 2450 | }; |
6963c3b9 | 2451 | /// @endcond |
7274deff | 2452 | |
6963c3b9 JW |
2453 | /** Utility to simplify expressions used in unevaluated operands |
2454 | * @since C++11 | |
2455 | * @ingroup utilities | |
2456 | */ | |
7274deff | 2457 | template<typename _Tp> |
ec26ff5a | 2458 | auto declval() noexcept -> decltype(__declval<_Tp>(0)) |
7274deff PC |
2459 | { |
2460 | static_assert(__declval_protector<_Tp>::__stop, | |
2461 | "declval() must not be used!"); | |
ec26ff5a | 2462 | return __declval<_Tp>(0); |
7274deff | 2463 | } |
1041daba | 2464 | |
be7f7822 JW |
2465 | /// result_of |
2466 | template<typename _Signature> | |
0e5abeb0 | 2467 | struct result_of; |
be7f7822 | 2468 | |
c0ffa2ba | 2469 | // Sfinae-friendly result_of implementation: |
83ddb39f | 2470 | |
6963c3b9 | 2471 | /// @cond undocumented |
93e95400 JW |
2472 | struct __invoke_memfun_ref { }; |
2473 | struct __invoke_memfun_deref { }; | |
2474 | struct __invoke_memobj_ref { }; | |
2475 | struct __invoke_memobj_deref { }; | |
2476 | struct __invoke_other { }; | |
2477 | ||
2478 | // Associate a tag type with a specialization of __success_type. | |
2479 | template<typename _Tp, typename _Tag> | |
2480 | struct __result_of_success : __success_type<_Tp> | |
2481 | { using __invoke_type = _Tag; }; | |
2482 | ||
83ddb39f DK |
2483 | // [func.require] paragraph 1 bullet 1: |
2484 | struct __result_of_memfun_ref_impl | |
2485 | { | |
2486 | template<typename _Fp, typename _Tp1, typename... _Args> | |
93e95400 | 2487 | static __result_of_success<decltype( |
83ddb39f | 2488 | (std::declval<_Tp1>().*std::declval<_Fp>())(std::declval<_Args>()...) |
93e95400 | 2489 | ), __invoke_memfun_ref> _S_test(int); |
83ddb39f DK |
2490 | |
2491 | template<typename...> | |
2492 | static __failure_type _S_test(...); | |
2493 | }; | |
2494 | ||
2495 | template<typename _MemPtr, typename _Arg, typename... _Args> | |
2496 | struct __result_of_memfun_ref | |
2497 | : private __result_of_memfun_ref_impl | |
2498 | { | |
067a8c7c | 2499 | using type = decltype(_S_test<_MemPtr, _Arg, _Args...>(0)); |
83ddb39f DK |
2500 | }; |
2501 | ||
2502 | // [func.require] paragraph 1 bullet 2: | |
2503 | struct __result_of_memfun_deref_impl | |
2504 | { | |
2505 | template<typename _Fp, typename _Tp1, typename... _Args> | |
93e95400 | 2506 | static __result_of_success<decltype( |
83ddb39f | 2507 | ((*std::declval<_Tp1>()).*std::declval<_Fp>())(std::declval<_Args>()...) |
93e95400 | 2508 | ), __invoke_memfun_deref> _S_test(int); |
83ddb39f DK |
2509 | |
2510 | template<typename...> | |
2511 | static __failure_type _S_test(...); | |
2512 | }; | |
2513 | ||
2514 | template<typename _MemPtr, typename _Arg, typename... _Args> | |
2515 | struct __result_of_memfun_deref | |
2516 | : private __result_of_memfun_deref_impl | |
2517 | { | |
067a8c7c | 2518 | using type = decltype(_S_test<_MemPtr, _Arg, _Args...>(0)); |
83ddb39f DK |
2519 | }; |
2520 | ||
2521 | // [func.require] paragraph 1 bullet 3: | |
2522 | struct __result_of_memobj_ref_impl | |
2523 | { | |
2524 | template<typename _Fp, typename _Tp1> | |
93e95400 | 2525 | static __result_of_success<decltype( |
83ddb39f | 2526 | std::declval<_Tp1>().*std::declval<_Fp>() |
93e95400 | 2527 | ), __invoke_memobj_ref> _S_test(int); |
83ddb39f DK |
2528 | |
2529 | template<typename, typename> | |
2530 | static __failure_type _S_test(...); | |
2531 | }; | |
2532 | ||
2533 | template<typename _MemPtr, typename _Arg> | |
2534 | struct __result_of_memobj_ref | |
2535 | : private __result_of_memobj_ref_impl | |
2536 | { | |
067a8c7c | 2537 | using type = decltype(_S_test<_MemPtr, _Arg>(0)); |
83ddb39f DK |
2538 | }; |
2539 | ||
2540 | // [func.require] paragraph 1 bullet 4: | |
2541 | struct __result_of_memobj_deref_impl | |
2542 | { | |
2543 | template<typename _Fp, typename _Tp1> | |
93e95400 | 2544 | static __result_of_success<decltype( |
83ddb39f | 2545 | (*std::declval<_Tp1>()).*std::declval<_Fp>() |
93e95400 | 2546 | ), __invoke_memobj_deref> _S_test(int); |
83ddb39f DK |
2547 | |
2548 | template<typename, typename> | |
2549 | static __failure_type _S_test(...); | |
2550 | }; | |
2551 | ||
be7f7822 | 2552 | template<typename _MemPtr, typename _Arg> |
83ddb39f DK |
2553 | struct __result_of_memobj_deref |
2554 | : private __result_of_memobj_deref_impl | |
2555 | { | |
067a8c7c | 2556 | using type = decltype(_S_test<_MemPtr, _Arg>(0)); |
83ddb39f DK |
2557 | }; |
2558 | ||
2559 | template<typename _MemPtr, typename _Arg> | |
2560 | struct __result_of_memobj; | |
be7f7822 JW |
2561 | |
2562 | template<typename _Res, typename _Class, typename _Arg> | |
83ddb39f | 2563 | struct __result_of_memobj<_Res _Class::*, _Arg> |
be7f7822 | 2564 | { |
067a8c7c KM |
2565 | using _Argval = __remove_cvref_t<_Arg>; |
2566 | using _MemPtr = _Res _Class::*; | |
2567 | using type = typename __conditional_t<__or_<is_same<_Argval, _Class>, | |
83ddb39f DK |
2568 | is_base_of<_Class, _Argval>>::value, |
2569 | __result_of_memobj_ref<_MemPtr, _Arg>, | |
2570 | __result_of_memobj_deref<_MemPtr, _Arg> | |
067a8c7c | 2571 | >::type; |
be7f7822 JW |
2572 | }; |
2573 | ||
83ddb39f DK |
2574 | template<typename _MemPtr, typename _Arg, typename... _Args> |
2575 | struct __result_of_memfun; | |
be7f7822 JW |
2576 | |
2577 | template<typename _Res, typename _Class, typename _Arg, typename... _Args> | |
83ddb39f | 2578 | struct __result_of_memfun<_Res _Class::*, _Arg, _Args...> |
be7f7822 | 2579 | { |
067a8c7c KM |
2580 | using _Argval = typename remove_reference<_Arg>::type; |
2581 | using _MemPtr = _Res _Class::*; | |
2582 | using type = typename __conditional_t<is_base_of<_Class, _Argval>::value, | |
83ddb39f DK |
2583 | __result_of_memfun_ref<_MemPtr, _Arg, _Args...>, |
2584 | __result_of_memfun_deref<_MemPtr, _Arg, _Args...> | |
067a8c7c | 2585 | >::type; |
be7f7822 JW |
2586 | }; |
2587 | ||
93e95400 JW |
2588 | // _GLIBCXX_RESOLVE_LIB_DEFECTS |
2589 | // 2219. INVOKE-ing a pointer to member with a reference_wrapper | |
2590 | // as the object expression | |
93e95400 | 2591 | |
7dcc645c | 2592 | // Used by result_of, invoke etc. to unwrap a reference_wrapper. |
81c7cf71 | 2593 | template<typename _Tp, typename _Up = __remove_cvref_t<_Tp>> |
7dcc645c JW |
2594 | struct __inv_unwrap |
2595 | { | |
2596 | using type = _Tp; | |
2597 | }; | |
f3d7dd52 | 2598 | |
7dcc645c JW |
2599 | template<typename _Tp, typename _Up> |
2600 | struct __inv_unwrap<_Tp, reference_wrapper<_Up>> | |
2601 | { | |
2602 | using type = _Up&; | |
2603 | }; | |
93e95400 | 2604 | |
be7f7822 | 2605 | template<bool, bool, typename _Functor, typename... _ArgTypes> |
83ddb39f | 2606 | struct __result_of_impl |
be7f7822 | 2607 | { |
067a8c7c | 2608 | using type = __failure_type; |
be7f7822 JW |
2609 | }; |
2610 | ||
2611 | template<typename _MemPtr, typename _Arg> | |
83ddb39f | 2612 | struct __result_of_impl<true, false, _MemPtr, _Arg> |
391d5d2e | 2613 | : public __result_of_memobj<__decay_t<_MemPtr>, |
7dcc645c | 2614 | typename __inv_unwrap<_Arg>::type> |
c4db9a77 | 2615 | { }; |
be7f7822 | 2616 | |
83ddb39f DK |
2617 | template<typename _MemPtr, typename _Arg, typename... _Args> |
2618 | struct __result_of_impl<false, true, _MemPtr, _Arg, _Args...> | |
391d5d2e | 2619 | : public __result_of_memfun<__decay_t<_MemPtr>, |
7dcc645c | 2620 | typename __inv_unwrap<_Arg>::type, _Args...> |
c4db9a77 | 2621 | { }; |
be7f7822 | 2622 | |
83ddb39f DK |
2623 | // [func.require] paragraph 1 bullet 5: |
2624 | struct __result_of_other_impl | |
2625 | { | |
2626 | template<typename _Fn, typename... _Args> | |
93e95400 | 2627 | static __result_of_success<decltype( |
83ddb39f | 2628 | std::declval<_Fn>()(std::declval<_Args>()...) |
93e95400 | 2629 | ), __invoke_other> _S_test(int); |
83ddb39f DK |
2630 | |
2631 | template<typename...> | |
2632 | static __failure_type _S_test(...); | |
2633 | }; | |
2634 | ||
be7f7822 | 2635 | template<typename _Functor, typename... _ArgTypes> |
83ddb39f DK |
2636 | struct __result_of_impl<false, false, _Functor, _ArgTypes...> |
2637 | : private __result_of_other_impl | |
be7f7822 | 2638 | { |
067a8c7c | 2639 | using type = decltype(_S_test<_Functor, _ArgTypes...>(0)); |
be7f7822 JW |
2640 | }; |
2641 | ||
7dcc645c | 2642 | // __invoke_result (std::invoke_result for C++11) |
83ddb39f | 2643 | template<typename _Functor, typename... _ArgTypes> |
7dcc645c | 2644 | struct __invoke_result |
83ddb39f DK |
2645 | : public __result_of_impl< |
2646 | is_member_object_pointer< | |
2647 | typename remove_reference<_Functor>::type | |
2648 | >::value, | |
2649 | is_member_function_pointer< | |
2650 | typename remove_reference<_Functor>::type | |
2651 | >::value, | |
7dcc645c | 2652 | _Functor, _ArgTypes... |
83ddb39f DK |
2653 | >::type |
2654 | { }; | |
6963c3b9 | 2655 | /// @endcond |
c0ffa2ba | 2656 | |
7dcc645c JW |
2657 | template<typename _Functor, typename... _ArgTypes> |
2658 | struct result_of<_Functor(_ArgTypes...)> | |
2659 | : public __invoke_result<_Functor, _ArgTypes...> | |
de196e5d | 2660 | { } _GLIBCXX17_DEPRECATED_SUGGEST("std::invoke_result"); |
7dcc645c | 2661 | |
e112d53a | 2662 | #if __cplusplus >= 201402L |
c76f55bf JW |
2663 | #pragma GCC diagnostic push |
2664 | #pragma GCC diagnostic ignored "-Wdeprecated-declarations" | |
4457e88c JW |
2665 | /// Alias template for aligned_storage |
2666 | template<size_t _Len, size_t _Align = | |
2667 | __alignof__(typename __aligned_storage_msa<_Len>::__type)> | |
aa02a69e | 2668 | using aligned_storage_t _GLIBCXX23_DEPRECATED = typename aligned_storage<_Len, _Align>::type; |
4457e88c | 2669 | |
d3718027 | 2670 | template <size_t _Len, typename... _Types> |
aa02a69e | 2671 | using aligned_union_t _GLIBCXX23_DEPRECATED = typename aligned_union<_Len, _Types...>::type; |
c76f55bf | 2672 | #pragma GCC diagnostic pop |
d3718027 | 2673 | |
4457e88c JW |
2674 | /// Alias template for decay |
2675 | template<typename _Tp> | |
2676 | using decay_t = typename decay<_Tp>::type; | |
2677 | ||
2678 | /// Alias template for enable_if | |
2679 | template<bool _Cond, typename _Tp = void> | |
2680 | using enable_if_t = typename enable_if<_Cond, _Tp>::type; | |
2681 | ||
2682 | /// Alias template for conditional | |
2683 | template<bool _Cond, typename _Iftrue, typename _Iffalse> | |
2684 | using conditional_t = typename conditional<_Cond, _Iftrue, _Iffalse>::type; | |
2685 | ||
2686 | /// Alias template for common_type | |
2687 | template<typename... _Tp> | |
2688 | using common_type_t = typename common_type<_Tp...>::type; | |
2689 | ||
2690 | /// Alias template for underlying_type | |
2691 | template<typename _Tp> | |
2692 | using underlying_type_t = typename underlying_type<_Tp>::type; | |
2693 | ||
2694 | /// Alias template for result_of | |
2695 | template<typename _Tp> | |
2696 | using result_of_t = typename result_of<_Tp>::type; | |
e112d53a JW |
2697 | #endif // C++14 |
2698 | ||
083b7f28 | 2699 | #ifdef __cpp_lib_void_t // C++ >= 17 || GNU++ >= 11 |
bd1eb5e0 JW |
2700 | /// A metafunction that always yields void, used for detecting valid types. |
2701 | template<typename...> using void_t = void; | |
2702 | #endif | |
2703 | ||
6963c3b9 JW |
2704 | /// @cond undocumented |
2705 | ||
2b667beb JW |
2706 | // Detection idiom. |
2707 | // Detect whether _Op<_Args...> is a valid type, use default _Def if not. | |
2708 | ||
2709 | #if __cpp_concepts | |
2710 | // Implementation of the detection idiom (negative case). | |
2711 | template<typename _Def, template<typename...> class _Op, typename... _Args> | |
2712 | struct __detected_or | |
2713 | { | |
2714 | using type = _Def; | |
2715 | using __is_detected = false_type; | |
2716 | }; | |
2717 | ||
2718 | // Implementation of the detection idiom (positive case). | |
2719 | template<typename _Def, template<typename...> class _Op, typename... _Args> | |
2720 | requires requires { typename _Op<_Args...>; } | |
2721 | struct __detected_or<_Def, _Op, _Args...> | |
2722 | { | |
2723 | using type = _Op<_Args...>; | |
2724 | using __is_detected = true_type; | |
2725 | }; | |
2726 | #else | |
6af6bef4 JW |
2727 | /// Implementation of the detection idiom (negative case). |
2728 | template<typename _Default, typename _AlwaysVoid, | |
2729 | template<typename...> class _Op, typename... _Args> | |
2730 | struct __detector | |
2731 | { | |
6af6bef4 | 2732 | using type = _Default; |
2b667beb | 2733 | using __is_detected = false_type; |
6af6bef4 JW |
2734 | }; |
2735 | ||
2736 | /// Implementation of the detection idiom (positive case). | |
2737 | template<typename _Default, template<typename...> class _Op, | |
2738 | typename... _Args> | |
2739 | struct __detector<_Default, __void_t<_Op<_Args...>>, _Op, _Args...> | |
2740 | { | |
6af6bef4 | 2741 | using type = _Op<_Args...>; |
2b667beb | 2742 | using __is_detected = true_type; |
6af6bef4 JW |
2743 | }; |
2744 | ||
6af6bef4 JW |
2745 | template<typename _Default, template<typename...> class _Op, |
2746 | typename... _Args> | |
2747 | using __detected_or = __detector<_Default, void, _Op, _Args...>; | |
2b667beb | 2748 | #endif // __cpp_concepts |
6af6bef4 JW |
2749 | |
2750 | // _Op<_Args...> if that is a valid type, otherwise _Default. | |
2751 | template<typename _Default, template<typename...> class _Op, | |
2752 | typename... _Args> | |
2753 | using __detected_or_t | |
2754 | = typename __detected_or<_Default, _Op, _Args...>::type; | |
2755 | ||
033b71ce PC |
2756 | /** |
2757 | * Use SFINAE to determine if the type _Tp has a publicly-accessible | |
2758 | * member type _NTYPE. | |
2759 | */ | |
82b12c4b | 2760 | #define _GLIBCXX_HAS_NESTED_TYPE(_NTYPE) \ |
847e9cf8 | 2761 | template<typename _Tp, typename = __void_t<>> \ |
82b12c4b | 2762 | struct __has_##_NTYPE \ |
847e9cf8 JW |
2763 | : false_type \ |
2764 | { }; \ | |
2765 | template<typename _Tp> \ | |
2766 | struct __has_##_NTYPE<_Tp, __void_t<typename _Tp::_NTYPE>> \ | |
2767 | : true_type \ | |
033b71ce PC |
2768 | { }; |
2769 | ||
26b5ace7 DK |
2770 | template <typename _Tp> |
2771 | struct __is_swappable; | |
ddb63209 | 2772 | |
26b5ace7 DK |
2773 | template <typename _Tp> |
2774 | struct __is_nothrow_swappable; | |
ddb63209 | 2775 | |
a2863bde VV |
2776 | template<typename> |
2777 | struct __is_tuple_like_impl : false_type | |
2778 | { }; | |
2779 | ||
a2863bde VV |
2780 | // Internal type trait that allows us to sfinae-protect tuple_cat. |
2781 | template<typename _Tp> | |
2782 | struct __is_tuple_like | |
6791489e | 2783 | : public __is_tuple_like_impl<__remove_cvref_t<_Tp>>::type |
a2863bde | 2784 | { }; |
6963c3b9 | 2785 | /// @endcond |
a2863bde | 2786 | |
ddb63209 | 2787 | template<typename _Tp> |
7a91c710 | 2788 | _GLIBCXX20_CONSTEXPR |
ddb63209 | 2789 | inline |
391d5d2e JW |
2790 | _Require<__not_<__is_tuple_like<_Tp>>, |
2791 | is_move_constructible<_Tp>, | |
2792 | is_move_assignable<_Tp>> | |
ddb63209 VV |
2793 | swap(_Tp&, _Tp&) |
2794 | noexcept(__and_<is_nothrow_move_constructible<_Tp>, | |
2795 | is_nothrow_move_assignable<_Tp>>::value); | |
2796 | ||
2797 | template<typename _Tp, size_t _Nm> | |
7a91c710 | 2798 | _GLIBCXX20_CONSTEXPR |
ddb63209 | 2799 | inline |
391d5d2e | 2800 | __enable_if_t<__is_swappable<_Tp>::value> |
ddb63209 | 2801 | swap(_Tp (&__a)[_Nm], _Tp (&__b)[_Nm]) |
26b5ace7 | 2802 | noexcept(__is_nothrow_swappable<_Tp>::value); |
ddb63209 | 2803 | |
6963c3b9 | 2804 | /// @cond undocumented |
26b5ace7 | 2805 | namespace __swappable_details { |
ddb63209 VV |
2806 | using std::swap; |
2807 | ||
26b5ace7 DK |
2808 | struct __do_is_swappable_impl |
2809 | { | |
2810 | template<typename _Tp, typename | |
2811 | = decltype(swap(std::declval<_Tp&>(), std::declval<_Tp&>()))> | |
2812 | static true_type __test(int); | |
2813 | ||
2814 | template<typename> | |
2815 | static false_type __test(...); | |
2816 | }; | |
2817 | ||
2818 | struct __do_is_nothrow_swappable_impl | |
2819 | { | |
2820 | template<typename _Tp> | |
2821 | static __bool_constant< | |
2822 | noexcept(swap(std::declval<_Tp&>(), std::declval<_Tp&>())) | |
2823 | > __test(int); | |
2824 | ||
2825 | template<typename> | |
2826 | static false_type __test(...); | |
2827 | }; | |
2828 | ||
6b9539e2 | 2829 | } // namespace __swappable_details |
ddb63209 | 2830 | |
26b5ace7 DK |
2831 | template<typename _Tp> |
2832 | struct __is_swappable_impl | |
2833 | : public __swappable_details::__do_is_swappable_impl | |
2834 | { | |
067a8c7c | 2835 | using type = decltype(__test<_Tp>(0)); |
26b5ace7 DK |
2836 | }; |
2837 | ||
2838 | template<typename _Tp> | |
ddb63209 | 2839 | struct __is_nothrow_swappable_impl |
26b5ace7 DK |
2840 | : public __swappable_details::__do_is_nothrow_swappable_impl |
2841 | { | |
067a8c7c | 2842 | using type = decltype(__test<_Tp>(0)); |
26b5ace7 | 2843 | }; |
ddb63209 | 2844 | |
26b5ace7 DK |
2845 | template<typename _Tp> |
2846 | struct __is_swappable | |
2847 | : public __is_swappable_impl<_Tp>::type | |
ddb63209 VV |
2848 | { }; |
2849 | ||
26b5ace7 | 2850 | template<typename _Tp> |
ddb63209 | 2851 | struct __is_nothrow_swappable |
26b5ace7 | 2852 | : public __is_nothrow_swappable_impl<_Tp>::type |
ddb63209 | 2853 | { }; |
6963c3b9 | 2854 | /// @endcond |
ddb63209 | 2855 | |
083b7f28 | 2856 | #ifdef __cpp_lib_is_swappable // C++ >= 17 || GNU++ >= 11 |
6b9539e2 DK |
2857 | /// Metafunctions used for detecting swappable types: p0185r1 |
2858 | ||
2859 | /// is_swappable | |
2860 | template<typename _Tp> | |
2861 | struct is_swappable | |
2862 | : public __is_swappable_impl<_Tp>::type | |
608a080c AP |
2863 | { |
2864 | static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}), | |
2865 | "template argument must be a complete class or an unbounded array"); | |
2866 | }; | |
6b9539e2 DK |
2867 | |
2868 | /// is_nothrow_swappable | |
2869 | template<typename _Tp> | |
2870 | struct is_nothrow_swappable | |
2871 | : public __is_nothrow_swappable_impl<_Tp>::type | |
608a080c AP |
2872 | { |
2873 | static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}), | |
2874 | "template argument must be a complete class or an unbounded array"); | |
2875 | }; | |
6b9539e2 DK |
2876 | |
2877 | #if __cplusplus >= 201402L | |
2878 | /// is_swappable_v | |
2879 | template<typename _Tp> | |
288695f7 DK |
2880 | _GLIBCXX17_INLINE constexpr bool is_swappable_v = |
2881 | is_swappable<_Tp>::value; | |
6b9539e2 DK |
2882 | |
2883 | /// is_nothrow_swappable_v | |
2884 | template<typename _Tp> | |
288695f7 DK |
2885 | _GLIBCXX17_INLINE constexpr bool is_nothrow_swappable_v = |
2886 | is_nothrow_swappable<_Tp>::value; | |
6b9539e2 DK |
2887 | #endif // __cplusplus >= 201402L |
2888 | ||
6963c3b9 | 2889 | /// @cond undocumented |
6b9539e2 DK |
2890 | namespace __swappable_with_details { |
2891 | using std::swap; | |
2892 | ||
2893 | struct __do_is_swappable_with_impl | |
2894 | { | |
2895 | template<typename _Tp, typename _Up, typename | |
2896 | = decltype(swap(std::declval<_Tp>(), std::declval<_Up>())), | |
2897 | typename | |
2898 | = decltype(swap(std::declval<_Up>(), std::declval<_Tp>()))> | |
2899 | static true_type __test(int); | |
2900 | ||
2901 | template<typename, typename> | |
2902 | static false_type __test(...); | |
2903 | }; | |
2904 | ||
2905 | struct __do_is_nothrow_swappable_with_impl | |
2906 | { | |
2907 | template<typename _Tp, typename _Up> | |
2908 | static __bool_constant< | |
2909 | noexcept(swap(std::declval<_Tp>(), std::declval<_Up>())) | |
2910 | && | |
2911 | noexcept(swap(std::declval<_Up>(), std::declval<_Tp>())) | |
2912 | > __test(int); | |
2913 | ||
2914 | template<typename, typename> | |
2915 | static false_type __test(...); | |
2916 | }; | |
2917 | ||
2918 | } // namespace __swappable_with_details | |
2919 | ||
2920 | template<typename _Tp, typename _Up> | |
2921 | struct __is_swappable_with_impl | |
2922 | : public __swappable_with_details::__do_is_swappable_with_impl | |
2923 | { | |
067a8c7c | 2924 | using type = decltype(__test<_Tp, _Up>(0)); |
6b9539e2 DK |
2925 | }; |
2926 | ||
2927 | // Optimization for the homogenous lvalue case, not required: | |
2928 | template<typename _Tp> | |
2929 | struct __is_swappable_with_impl<_Tp&, _Tp&> | |
2930 | : public __swappable_details::__do_is_swappable_impl | |
2931 | { | |
067a8c7c | 2932 | using type = decltype(__test<_Tp&>(0)); |
6b9539e2 DK |
2933 | }; |
2934 | ||
2935 | template<typename _Tp, typename _Up> | |
2936 | struct __is_nothrow_swappable_with_impl | |
2937 | : public __swappable_with_details::__do_is_nothrow_swappable_with_impl | |
2938 | { | |
067a8c7c | 2939 | using type = decltype(__test<_Tp, _Up>(0)); |
6b9539e2 DK |
2940 | }; |
2941 | ||
2942 | // Optimization for the homogenous lvalue case, not required: | |
2943 | template<typename _Tp> | |
2944 | struct __is_nothrow_swappable_with_impl<_Tp&, _Tp&> | |
2945 | : public __swappable_details::__do_is_nothrow_swappable_impl | |
2946 | { | |
067a8c7c | 2947 | using type = decltype(__test<_Tp&>(0)); |
6b9539e2 | 2948 | }; |
6963c3b9 | 2949 | /// @endcond |
6b9539e2 DK |
2950 | |
2951 | /// is_swappable_with | |
2952 | template<typename _Tp, typename _Up> | |
2953 | struct is_swappable_with | |
2954 | : public __is_swappable_with_impl<_Tp, _Up>::type | |
69f571ff AP |
2955 | { |
2956 | static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}), | |
2957 | "first template argument must be a complete class or an unbounded array"); | |
2958 | static_assert(std::__is_complete_or_unbounded(__type_identity<_Up>{}), | |
2959 | "second template argument must be a complete class or an unbounded array"); | |
2960 | }; | |
6b9539e2 DK |
2961 | |
2962 | /// is_nothrow_swappable_with | |
2963 | template<typename _Tp, typename _Up> | |
2964 | struct is_nothrow_swappable_with | |
2965 | : public __is_nothrow_swappable_with_impl<_Tp, _Up>::type | |
69f571ff AP |
2966 | { |
2967 | static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}), | |
2968 | "first template argument must be a complete class or an unbounded array"); | |
2969 | static_assert(std::__is_complete_or_unbounded(__type_identity<_Up>{}), | |
2970 | "second template argument must be a complete class or an unbounded array"); | |
2971 | }; | |
6b9539e2 DK |
2972 | |
2973 | #if __cplusplus >= 201402L | |
2974 | /// is_swappable_with_v | |
2975 | template<typename _Tp, typename _Up> | |
288695f7 DK |
2976 | _GLIBCXX17_INLINE constexpr bool is_swappable_with_v = |
2977 | is_swappable_with<_Tp, _Up>::value; | |
6b9539e2 DK |
2978 | |
2979 | /// is_nothrow_swappable_with_v | |
2980 | template<typename _Tp, typename _Up> | |
288695f7 | 2981 | _GLIBCXX17_INLINE constexpr bool is_nothrow_swappable_with_v = |
6b9539e2 DK |
2982 | is_nothrow_swappable_with<_Tp, _Up>::value; |
2983 | #endif // __cplusplus >= 201402L | |
137422c8 | 2984 | |
083b7f28 | 2985 | #endif // __cpp_lib_is_swappable |
42183d03 | 2986 | |
6963c3b9 JW |
2987 | /// @cond undocumented |
2988 | ||
7dcc645c | 2989 | // __is_invocable (std::is_invocable for C++11) |
42183d03 | 2990 | |
d91f618d JW |
2991 | // The primary template is used for invalid INVOKE expressions. |
2992 | template<typename _Result, typename _Ret, | |
2993 | bool = is_void<_Ret>::value, typename = void> | |
71c828f8 JW |
2994 | struct __is_invocable_impl |
2995 | : false_type | |
2996 | { | |
fa9bda3e | 2997 | using __nothrow_conv = false_type; // For is_nothrow_invocable_r |
71c828f8 | 2998 | }; |
42183d03 | 2999 | |
d91f618d | 3000 | // Used for valid INVOKE and INVOKE<void> expressions. |
42183d03 | 3001 | template<typename _Result, typename _Ret> |
d91f618d JW |
3002 | struct __is_invocable_impl<_Result, _Ret, |
3003 | /* is_void<_Ret> = */ true, | |
3004 | __void_t<typename _Result::type>> | |
3005 | : true_type | |
71c828f8 | 3006 | { |
fa9bda3e | 3007 | using __nothrow_conv = true_type; // For is_nothrow_invocable_r |
71c828f8 | 3008 | }; |
42183d03 | 3009 | |
d91f618d JW |
3010 | #pragma GCC diagnostic push |
3011 | #pragma GCC diagnostic ignored "-Wctor-dtor-privacy" | |
3012 | // Used for INVOKE<R> expressions to check the implicit conversion to R. | |
3013 | template<typename _Result, typename _Ret> | |
3014 | struct __is_invocable_impl<_Result, _Ret, | |
3015 | /* is_void<_Ret> = */ false, | |
3016 | __void_t<typename _Result::type>> | |
3017 | { | |
3018 | private: | |
3019 | // The type of the INVOKE expression. | |
fa9bda3e JW |
3020 | using _Res_t = typename _Result::type; |
3021 | ||
71c828f8 JW |
3022 | // Unlike declval, this doesn't add_rvalue_reference, so it respects |
3023 | // guaranteed copy elision. | |
fa9bda3e | 3024 | static _Res_t _S_get() noexcept; |
d91f618d | 3025 | |
fa9bda3e | 3026 | // Used to check if _Res_t can implicitly convert to _Tp. |
d91f618d | 3027 | template<typename _Tp> |
fa9bda3e | 3028 | static void _S_conv(__type_identity_t<_Tp>) noexcept; |
d91f618d JW |
3029 | |
3030 | // This overload is viable if INVOKE(f, args...) can convert to _Tp. | |
fa9bda3e JW |
3031 | template<typename _Tp, |
3032 | bool _Nothrow = noexcept(_S_conv<_Tp>(_S_get())), | |
71c828f8 | 3033 | typename = decltype(_S_conv<_Tp>(_S_get())), |
df7f2736 JW |
3034 | #if __has_builtin(__reference_converts_from_temporary) |
3035 | bool _Dangle = __reference_converts_from_temporary(_Tp, _Res_t) | |
3036 | #else | |
3037 | bool _Dangle = false | |
3038 | #endif | |
3039 | > | |
fa9bda3e | 3040 | static __bool_constant<_Nothrow && !_Dangle> |
d91f618d JW |
3041 | _S_test(int); |
3042 | ||
71c828f8 | 3043 | template<typename _Tp, bool = false> |
d91f618d JW |
3044 | static false_type |
3045 | _S_test(...); | |
3046 | ||
3047 | public: | |
71c828f8 | 3048 | // For is_invocable_r |
fa9bda3e | 3049 | using type = decltype(_S_test<_Ret, /* Nothrow = */ true>(1)); |
71c828f8 JW |
3050 | |
3051 | // For is_nothrow_invocable_r | |
fa9bda3e | 3052 | using __nothrow_conv = decltype(_S_test<_Ret>(1)); |
d91f618d JW |
3053 | }; |
3054 | #pragma GCC diagnostic pop | |
3055 | ||
7dcc645c JW |
3056 | template<typename _Fn, typename... _ArgTypes> |
3057 | struct __is_invocable | |
3058 | : __is_invocable_impl<__invoke_result<_Fn, _ArgTypes...>, void>::type | |
42183d03 JW |
3059 | { }; |
3060 | ||
42183d03 JW |
3061 | template<typename _Fn, typename _Tp, typename... _Args> |
3062 | constexpr bool __call_is_nt(__invoke_memfun_ref) | |
3063 | { | |
3064 | using _Up = typename __inv_unwrap<_Tp>::type; | |
3065 | return noexcept((std::declval<_Up>().*std::declval<_Fn>())( | |
3066 | std::declval<_Args>()...)); | |
3067 | } | |
3068 | ||
3069 | template<typename _Fn, typename _Tp, typename... _Args> | |
3070 | constexpr bool __call_is_nt(__invoke_memfun_deref) | |
3071 | { | |
3072 | return noexcept(((*std::declval<_Tp>()).*std::declval<_Fn>())( | |
3073 | std::declval<_Args>()...)); | |
3074 | } | |
3075 | ||
3076 | template<typename _Fn, typename _Tp> | |
3077 | constexpr bool __call_is_nt(__invoke_memobj_ref) | |
3078 | { | |
3079 | using _Up = typename __inv_unwrap<_Tp>::type; | |
3080 | return noexcept(std::declval<_Up>().*std::declval<_Fn>()); | |
3081 | } | |
3082 | ||
3083 | template<typename _Fn, typename _Tp> | |
3084 | constexpr bool __call_is_nt(__invoke_memobj_deref) | |
3085 | { | |
3086 | return noexcept((*std::declval<_Tp>()).*std::declval<_Fn>()); | |
3087 | } | |
3088 | ||
3089 | template<typename _Fn, typename... _Args> | |
3090 | constexpr bool __call_is_nt(__invoke_other) | |
3091 | { | |
3092 | return noexcept(std::declval<_Fn>()(std::declval<_Args>()...)); | |
3093 | } | |
3094 | ||
7dcc645c | 3095 | template<typename _Result, typename _Fn, typename... _Args> |
42183d03 JW |
3096 | struct __call_is_nothrow |
3097 | : __bool_constant< | |
7dcc645c JW |
3098 | std::__call_is_nt<_Fn, _Args...>(typename _Result::__invoke_type{}) |
3099 | > | |
42183d03 JW |
3100 | { }; |
3101 | ||
7dcc645c JW |
3102 | template<typename _Fn, typename... _Args> |
3103 | using __call_is_nothrow_ | |
3104 | = __call_is_nothrow<__invoke_result<_Fn, _Args...>, _Fn, _Args...>; | |
42183d03 | 3105 | |
7dcc645c JW |
3106 | // __is_nothrow_invocable (std::is_nothrow_invocable for C++11) |
3107 | template<typename _Fn, typename... _Args> | |
3108 | struct __is_nothrow_invocable | |
3109 | : __and_<__is_invocable<_Fn, _Args...>, | |
3110 | __call_is_nothrow_<_Fn, _Args...>>::type | |
42183d03 JW |
3111 | { }; |
3112 | ||
cc28d234 JW |
3113 | #pragma GCC diagnostic push |
3114 | #pragma GCC diagnostic ignored "-Wctor-dtor-privacy" | |
a73d2fa8 NDR |
3115 | struct __nonesuchbase {}; |
3116 | struct __nonesuch : private __nonesuchbase { | |
f524d5b3 VV |
3117 | ~__nonesuch() = delete; |
3118 | __nonesuch(__nonesuch const&) = delete; | |
3119 | void operator=(__nonesuch const&) = delete; | |
3120 | }; | |
cc28d234 | 3121 | #pragma GCC diagnostic pop |
6963c3b9 | 3122 | /// @endcond |
f524d5b3 | 3123 | |
083b7f28 | 3124 | #ifdef __cpp_lib_is_invocable // C++ >= 17 |
7dcc645c JW |
3125 | /// std::invoke_result |
3126 | template<typename _Functor, typename... _ArgTypes> | |
3127 | struct invoke_result | |
3128 | : public __invoke_result<_Functor, _ArgTypes...> | |
69f571ff AP |
3129 | { |
3130 | static_assert(std::__is_complete_or_unbounded(__type_identity<_Functor>{}), | |
3131 | "_Functor must be a complete class or an unbounded array"); | |
c1fc9f6e AP |
3132 | static_assert((std::__is_complete_or_unbounded( |
3133 | __type_identity<_ArgTypes>{}) && ...), | |
3134 | "each argument type must be a complete class or an unbounded array"); | |
69f571ff | 3135 | }; |
7dcc645c JW |
3136 | |
3137 | /// std::invoke_result_t | |
3138 | template<typename _Fn, typename... _Args> | |
3139 | using invoke_result_t = typename invoke_result<_Fn, _Args...>::type; | |
42183d03 | 3140 | |
7dcc645c JW |
3141 | /// std::is_invocable |
3142 | template<typename _Fn, typename... _ArgTypes> | |
3143 | struct is_invocable | |
3144 | : __is_invocable_impl<__invoke_result<_Fn, _ArgTypes...>, void>::type | |
608a080c AP |
3145 | { |
3146 | static_assert(std::__is_complete_or_unbounded(__type_identity<_Fn>{}), | |
3147 | "_Fn must be a complete class or an unbounded array"); | |
c1fc9f6e AP |
3148 | static_assert((std::__is_complete_or_unbounded( |
3149 | __type_identity<_ArgTypes>{}) && ...), | |
3150 | "each argument type must be a complete class or an unbounded array"); | |
608a080c | 3151 | }; |
42183d03 | 3152 | |
7dcc645c JW |
3153 | /// std::is_invocable_r |
3154 | template<typename _Ret, typename _Fn, typename... _ArgTypes> | |
3155 | struct is_invocable_r | |
3156 | : __is_invocable_impl<__invoke_result<_Fn, _ArgTypes...>, _Ret>::type | |
608a080c AP |
3157 | { |
3158 | static_assert(std::__is_complete_or_unbounded(__type_identity<_Fn>{}), | |
3159 | "_Fn must be a complete class or an unbounded array"); | |
c1fc9f6e AP |
3160 | static_assert((std::__is_complete_or_unbounded( |
3161 | __type_identity<_ArgTypes>{}) && ...), | |
3162 | "each argument type must be a complete class or an unbounded array"); | |
3163 | static_assert(std::__is_complete_or_unbounded(__type_identity<_Ret>{}), | |
3164 | "_Ret must be a complete class or an unbounded array"); | |
608a080c | 3165 | }; |
42183d03 | 3166 | |
7dcc645c JW |
3167 | /// std::is_nothrow_invocable |
3168 | template<typename _Fn, typename... _ArgTypes> | |
3169 | struct is_nothrow_invocable | |
3170 | : __and_<__is_invocable_impl<__invoke_result<_Fn, _ArgTypes...>, void>, | |
608a080c AP |
3171 | __call_is_nothrow_<_Fn, _ArgTypes...>>::type |
3172 | { | |
3173 | static_assert(std::__is_complete_or_unbounded(__type_identity<_Fn>{}), | |
3174 | "_Fn must be a complete class or an unbounded array"); | |
c1fc9f6e AP |
3175 | static_assert((std::__is_complete_or_unbounded( |
3176 | __type_identity<_ArgTypes>{}) && ...), | |
3177 | "each argument type must be a complete class or an unbounded array"); | |
608a080c | 3178 | }; |
42183d03 | 3179 | |
6963c3b9 | 3180 | /// @cond undocumented |
fa9bda3e JW |
3181 | // This checks that the INVOKE<R> expression is well-formed and that the |
3182 | // conversion to R does not throw. It does *not* check whether the INVOKE | |
3183 | // expression itself can throw. That is done by __call_is_nothrow_ instead. | |
c4b06e7f | 3184 | template<typename _Result, typename _Ret> |
71c828f8 | 3185 | using __is_nt_invocable_impl |
fa9bda3e | 3186 | = typename __is_invocable_impl<_Result, _Ret>::__nothrow_conv; |
6963c3b9 | 3187 | /// @endcond |
c4b06e7f | 3188 | |
7dcc645c JW |
3189 | /// std::is_nothrow_invocable_r |
3190 | template<typename _Ret, typename _Fn, typename... _ArgTypes> | |
3191 | struct is_nothrow_invocable_r | |
c4b06e7f | 3192 | : __and_<__is_nt_invocable_impl<__invoke_result<_Fn, _ArgTypes...>, _Ret>, |
7dcc645c | 3193 | __call_is_nothrow_<_Fn, _ArgTypes...>>::type |
69f571ff AP |
3194 | { |
3195 | static_assert(std::__is_complete_or_unbounded(__type_identity<_Fn>{}), | |
3196 | "_Fn must be a complete class or an unbounded array"); | |
c1fc9f6e AP |
3197 | static_assert((std::__is_complete_or_unbounded( |
3198 | __type_identity<_ArgTypes>{}) && ...), | |
3199 | "each argument type must be a complete class or an unbounded array"); | |
3200 | static_assert(std::__is_complete_or_unbounded(__type_identity<_Ret>{}), | |
3201 | "_Ret must be a complete class or an unbounded array"); | |
69f571ff | 3202 | }; |
083b7f28 | 3203 | #endif // __cpp_lib_is_invocable |
42183d03 | 3204 | |
083b7f28 | 3205 | #if __cpp_lib_type_trait_variable_templates // C++ >= 17 |
6963c3b9 | 3206 | /** |
da89dfc2 | 3207 | * @defgroup variable_templates Variable templates for type traits |
6963c3b9 JW |
3208 | * @ingroup metaprogramming |
3209 | * | |
da89dfc2 JW |
3210 | * Each variable `is_xxx_v<T>` is a boolean constant with the same value |
3211 | * as the `value` member of the corresponding type trait `is_xxx<T>`. | |
6963c3b9 | 3212 | * |
aba938d6 | 3213 | * @since C++17 unless noted otherwise. |
6963c3b9 JW |
3214 | */ |
3215 | ||
da89dfc2 | 3216 | /** |
6963c3b9 | 3217 | * @{ |
da89dfc2 | 3218 | * @ingroup variable_templates |
6963c3b9 | 3219 | */ |
137422c8 | 3220 | template <typename _Tp> |
288695f7 | 3221 | inline constexpr bool is_void_v = is_void<_Tp>::value; |
137422c8 | 3222 | template <typename _Tp> |
288695f7 | 3223 | inline constexpr bool is_null_pointer_v = is_null_pointer<_Tp>::value; |
137422c8 | 3224 | template <typename _Tp> |
288695f7 | 3225 | inline constexpr bool is_integral_v = is_integral<_Tp>::value; |
137422c8 | 3226 | template <typename _Tp> |
288695f7 | 3227 | inline constexpr bool is_floating_point_v = is_floating_point<_Tp>::value; |
0e1b1222 | 3228 | |
7fd9c349 KM |
3229 | #if _GLIBCXX_USE_BUILTIN_TRAIT(__is_array) |
3230 | template <typename _Tp> | |
3231 | inline constexpr bool is_array_v = __is_array(_Tp); | |
3232 | #else | |
0e1b1222 JW |
3233 | template <typename _Tp> |
3234 | inline constexpr bool is_array_v = false; | |
137422c8 | 3235 | template <typename _Tp> |
0e1b1222 JW |
3236 | inline constexpr bool is_array_v<_Tp[]> = true; |
3237 | template <typename _Tp, size_t _Num> | |
3238 | inline constexpr bool is_array_v<_Tp[_Num]> = true; | |
7fd9c349 | 3239 | #endif |
0e1b1222 | 3240 | |
137422c8 | 3241 | template <typename _Tp> |
288695f7 | 3242 | inline constexpr bool is_pointer_v = is_pointer<_Tp>::value; |
137422c8 | 3243 | template <typename _Tp> |
33005a4b | 3244 | inline constexpr bool is_lvalue_reference_v = false; |
137422c8 | 3245 | template <typename _Tp> |
33005a4b JW |
3246 | inline constexpr bool is_lvalue_reference_v<_Tp&> = true; |
3247 | template <typename _Tp> | |
3248 | inline constexpr bool is_rvalue_reference_v = false; | |
3249 | template <typename _Tp> | |
3250 | inline constexpr bool is_rvalue_reference_v<_Tp&&> = true; | |
fa454b8d KM |
3251 | |
3252 | #if _GLIBCXX_USE_BUILTIN_TRAIT(__is_member_object_pointer) | |
3253 | template <typename _Tp> | |
3254 | inline constexpr bool is_member_object_pointer_v = | |
3255 | __is_member_object_pointer(_Tp); | |
3256 | #else | |
137422c8 | 3257 | template <typename _Tp> |
288695f7 | 3258 | inline constexpr bool is_member_object_pointer_v = |
137422c8 | 3259 | is_member_object_pointer<_Tp>::value; |
fa454b8d | 3260 | #endif |
53f9d0cc KM |
3261 | |
3262 | #if _GLIBCXX_USE_BUILTIN_TRAIT(__is_member_function_pointer) | |
3263 | template <typename _Tp> | |
3264 | inline constexpr bool is_member_function_pointer_v = | |
3265 | __is_member_function_pointer(_Tp); | |
3266 | #else | |
137422c8 | 3267 | template <typename _Tp> |
288695f7 | 3268 | inline constexpr bool is_member_function_pointer_v = |
137422c8 | 3269 | is_member_function_pointer<_Tp>::value; |
53f9d0cc KM |
3270 | #endif |
3271 | ||
137422c8 | 3272 | template <typename _Tp> |
cd20d948 | 3273 | inline constexpr bool is_enum_v = __is_enum(_Tp); |
137422c8 | 3274 | template <typename _Tp> |
cd20d948 | 3275 | inline constexpr bool is_union_v = __is_union(_Tp); |
137422c8 | 3276 | template <typename _Tp> |
cd20d948 | 3277 | inline constexpr bool is_class_v = __is_class(_Tp); |
cdd4387c | 3278 | // is_function_v is defined below, after is_const_v. |
e86cfcae KM |
3279 | |
3280 | #if _GLIBCXX_USE_BUILTIN_TRAIT(__is_reference) | |
3281 | template <typename _Tp> | |
3282 | inline constexpr bool is_reference_v = __is_reference(_Tp); | |
3283 | #else | |
137422c8 | 3284 | template <typename _Tp> |
33005a4b JW |
3285 | inline constexpr bool is_reference_v = false; |
3286 | template <typename _Tp> | |
3287 | inline constexpr bool is_reference_v<_Tp&> = true; | |
3288 | template <typename _Tp> | |
3289 | inline constexpr bool is_reference_v<_Tp&&> = true; | |
e86cfcae KM |
3290 | #endif |
3291 | ||
137422c8 | 3292 | template <typename _Tp> |
288695f7 | 3293 | inline constexpr bool is_arithmetic_v = is_arithmetic<_Tp>::value; |
137422c8 | 3294 | template <typename _Tp> |
288695f7 | 3295 | inline constexpr bool is_fundamental_v = is_fundamental<_Tp>::value; |
4b111013 KM |
3296 | |
3297 | #if _GLIBCXX_USE_BUILTIN_TRAIT(__is_object) | |
3298 | template <typename _Tp> | |
3299 | inline constexpr bool is_object_v = __is_object(_Tp); | |
3300 | #else | |
137422c8 | 3301 | template <typename _Tp> |
288695f7 | 3302 | inline constexpr bool is_object_v = is_object<_Tp>::value; |
4b111013 KM |
3303 | #endif |
3304 | ||
137422c8 | 3305 | template <typename _Tp> |
288695f7 | 3306 | inline constexpr bool is_scalar_v = is_scalar<_Tp>::value; |
137422c8 | 3307 | template <typename _Tp> |
288695f7 | 3308 | inline constexpr bool is_compound_v = is_compound<_Tp>::value; |
d95e5434 KM |
3309 | |
3310 | #if _GLIBCXX_USE_BUILTIN_TRAIT(__is_member_pointer) | |
3311 | template <typename _Tp> | |
3312 | inline constexpr bool is_member_pointer_v = __is_member_pointer(_Tp); | |
3313 | #else | |
137422c8 | 3314 | template <typename _Tp> |
288695f7 | 3315 | inline constexpr bool is_member_pointer_v = is_member_pointer<_Tp>::value; |
d95e5434 KM |
3316 | #endif |
3317 | ||
137422c8 | 3318 | template <typename _Tp> |
33005a4b JW |
3319 | inline constexpr bool is_const_v = false; |
3320 | template <typename _Tp> | |
3321 | inline constexpr bool is_const_v<const _Tp> = true; | |
cdd4387c KM |
3322 | |
3323 | #if _GLIBCXX_USE_BUILTIN_TRAIT(__is_function) | |
3324 | template <typename _Tp> | |
3325 | inline constexpr bool is_function_v = __is_function(_Tp); | |
3326 | #else | |
3327 | template <typename _Tp> | |
3328 | inline constexpr bool is_function_v = !is_const_v<const _Tp>; | |
3329 | template <typename _Tp> | |
3330 | inline constexpr bool is_function_v<_Tp&> = false; | |
3331 | template <typename _Tp> | |
3332 | inline constexpr bool is_function_v<_Tp&&> = false; | |
3333 | #endif | |
3334 | ||
33005a4b JW |
3335 | template <typename _Tp> |
3336 | inline constexpr bool is_volatile_v = false; | |
137422c8 | 3337 | template <typename _Tp> |
33005a4b | 3338 | inline constexpr bool is_volatile_v<volatile _Tp> = true; |
7b3587b3 | 3339 | |
137422c8 | 3340 | template <typename _Tp> |
7b3587b3 | 3341 | inline constexpr bool is_trivial_v = __is_trivial(_Tp); |
137422c8 | 3342 | template <typename _Tp> |
7b3587b3 | 3343 | inline constexpr bool is_trivially_copyable_v = __is_trivially_copyable(_Tp); |
137422c8 | 3344 | template <typename _Tp> |
7b3587b3 | 3345 | inline constexpr bool is_standard_layout_v = __is_standard_layout(_Tp); |
137422c8 | 3346 | template <typename _Tp> |
4f49ae60 | 3347 | _GLIBCXX20_DEPRECATED_SUGGEST("is_standard_layout_v && is_trivial_v") |
7b3587b3 | 3348 | inline constexpr bool is_pod_v = __is_pod(_Tp); |
137422c8 | 3349 | template <typename _Tp> |
24b54628 | 3350 | _GLIBCXX17_DEPRECATED |
7b3587b3 | 3351 | inline constexpr bool is_literal_type_v = __is_literal_type(_Tp); |
137422c8 | 3352 | template <typename _Tp> |
cd20d948 | 3353 | inline constexpr bool is_empty_v = __is_empty(_Tp); |
137422c8 | 3354 | template <typename _Tp> |
cd20d948 | 3355 | inline constexpr bool is_polymorphic_v = __is_polymorphic(_Tp); |
137422c8 | 3356 | template <typename _Tp> |
cd20d948 JW |
3357 | inline constexpr bool is_abstract_v = __is_abstract(_Tp); |
3358 | template <typename _Tp> | |
3359 | inline constexpr bool is_final_v = __is_final(_Tp); | |
7b3587b3 | 3360 | |
137422c8 | 3361 | template <typename _Tp> |
288695f7 | 3362 | inline constexpr bool is_signed_v = is_signed<_Tp>::value; |
137422c8 | 3363 | template <typename _Tp> |
288695f7 | 3364 | inline constexpr bool is_unsigned_v = is_unsigned<_Tp>::value; |
45433832 | 3365 | |
137422c8 | 3366 | template <typename _Tp, typename... _Args> |
45433832 | 3367 | inline constexpr bool is_constructible_v = __is_constructible(_Tp, _Args...); |
137422c8 | 3368 | template <typename _Tp> |
45433832 | 3369 | inline constexpr bool is_default_constructible_v = __is_constructible(_Tp); |
137422c8 | 3370 | template <typename _Tp> |
45433832 JW |
3371 | inline constexpr bool is_copy_constructible_v |
3372 | = __is_constructible(_Tp, __add_lval_ref_t<const _Tp>); | |
137422c8 | 3373 | template <typename _Tp> |
45433832 JW |
3374 | inline constexpr bool is_move_constructible_v |
3375 | = __is_constructible(_Tp, __add_rval_ref_t<_Tp>); | |
3376 | ||
137422c8 | 3377 | template <typename _Tp, typename _Up> |
45433832 | 3378 | inline constexpr bool is_assignable_v = __is_assignable(_Tp, _Up); |
137422c8 | 3379 | template <typename _Tp> |
45433832 JW |
3380 | inline constexpr bool is_copy_assignable_v |
3381 | = __is_assignable(__add_lval_ref_t<_Tp>, __add_lval_ref_t<const _Tp>); | |
137422c8 | 3382 | template <typename _Tp> |
45433832 JW |
3383 | inline constexpr bool is_move_assignable_v |
3384 | = __is_assignable(__add_lval_ref_t<_Tp>, __add_rval_ref_t<_Tp>); | |
3385 | ||
137422c8 | 3386 | template <typename _Tp> |
288695f7 | 3387 | inline constexpr bool is_destructible_v = is_destructible<_Tp>::value; |
45433832 | 3388 | |
137422c8 | 3389 | template <typename _Tp, typename... _Args> |
45433832 JW |
3390 | inline constexpr bool is_trivially_constructible_v |
3391 | = __is_trivially_constructible(_Tp, _Args...); | |
137422c8 | 3392 | template <typename _Tp> |
45433832 JW |
3393 | inline constexpr bool is_trivially_default_constructible_v |
3394 | = __is_trivially_constructible(_Tp); | |
137422c8 | 3395 | template <typename _Tp> |
45433832 JW |
3396 | inline constexpr bool is_trivially_copy_constructible_v |
3397 | = __is_trivially_constructible(_Tp, __add_lval_ref_t<const _Tp>); | |
137422c8 | 3398 | template <typename _Tp> |
45433832 JW |
3399 | inline constexpr bool is_trivially_move_constructible_v |
3400 | = __is_trivially_constructible(_Tp, __add_rval_ref_t<_Tp>); | |
3401 | ||
137422c8 | 3402 | template <typename _Tp, typename _Up> |
45433832 JW |
3403 | inline constexpr bool is_trivially_assignable_v |
3404 | = __is_trivially_assignable(_Tp, _Up); | |
137422c8 | 3405 | template <typename _Tp> |
45433832 JW |
3406 | inline constexpr bool is_trivially_copy_assignable_v |
3407 | = __is_trivially_assignable(__add_lval_ref_t<_Tp>, | |
3408 | __add_lval_ref_t<const _Tp>); | |
137422c8 | 3409 | template <typename _Tp> |
45433832 JW |
3410 | inline constexpr bool is_trivially_move_assignable_v |
3411 | = __is_trivially_assignable(__add_lval_ref_t<_Tp>, | |
3412 | __add_rval_ref_t<_Tp>); | |
137422c8 | 3413 | template <typename _Tp> |
288695f7 | 3414 | inline constexpr bool is_trivially_destructible_v = |
137422c8 VV |
3415 | is_trivially_destructible<_Tp>::value; |
3416 | template <typename _Tp, typename... _Args> | |
45433832 JW |
3417 | inline constexpr bool is_nothrow_constructible_v |
3418 | = __is_nothrow_constructible(_Tp, _Args...); | |
137422c8 | 3419 | template <typename _Tp> |
45433832 JW |
3420 | inline constexpr bool is_nothrow_default_constructible_v |
3421 | = __is_nothrow_constructible(_Tp); | |
137422c8 | 3422 | template <typename _Tp> |
45433832 JW |
3423 | inline constexpr bool is_nothrow_copy_constructible_v |
3424 | = __is_nothrow_constructible(_Tp, __add_lval_ref_t<const _Tp>); | |
137422c8 | 3425 | template <typename _Tp> |
45433832 JW |
3426 | inline constexpr bool is_nothrow_move_constructible_v |
3427 | = __is_nothrow_constructible(_Tp, __add_rval_ref_t<_Tp>); | |
3428 | ||
137422c8 | 3429 | template <typename _Tp, typename _Up> |
45433832 JW |
3430 | inline constexpr bool is_nothrow_assignable_v |
3431 | = __is_nothrow_assignable(_Tp, _Up); | |
137422c8 | 3432 | template <typename _Tp> |
45433832 JW |
3433 | inline constexpr bool is_nothrow_copy_assignable_v |
3434 | = __is_nothrow_assignable(__add_lval_ref_t<_Tp>, | |
3435 | __add_lval_ref_t<const _Tp>); | |
137422c8 | 3436 | template <typename _Tp> |
45433832 JW |
3437 | inline constexpr bool is_nothrow_move_assignable_v |
3438 | = __is_nothrow_assignable(__add_lval_ref_t<_Tp>, __add_rval_ref_t<_Tp>); | |
3439 | ||
137422c8 | 3440 | template <typename _Tp> |
288695f7 | 3441 | inline constexpr bool is_nothrow_destructible_v = |
137422c8 | 3442 | is_nothrow_destructible<_Tp>::value; |
7b3587b3 | 3443 | |
137422c8 | 3444 | template <typename _Tp> |
7b3587b3 JW |
3445 | inline constexpr bool has_virtual_destructor_v |
3446 | = __has_virtual_destructor(_Tp); | |
3447 | ||
137422c8 | 3448 | template <typename _Tp> |
288695f7 | 3449 | inline constexpr size_t alignment_of_v = alignment_of<_Tp>::value; |
0e1b1222 JW |
3450 | |
3451 | template <typename _Tp> | |
3452 | inline constexpr size_t rank_v = 0; | |
3453 | template <typename _Tp, size_t _Size> | |
3454 | inline constexpr size_t rank_v<_Tp[_Size]> = 1 + rank_v<_Tp>; | |
137422c8 | 3455 | template <typename _Tp> |
0e1b1222 JW |
3456 | inline constexpr size_t rank_v<_Tp[]> = 1 + rank_v<_Tp>; |
3457 | ||
137422c8 | 3458 | template <typename _Tp, unsigned _Idx = 0> |
0e1b1222 JW |
3459 | inline constexpr size_t extent_v = 0; |
3460 | template <typename _Tp, size_t _Size> | |
3461 | inline constexpr size_t extent_v<_Tp[_Size], 0> = _Size; | |
3462 | template <typename _Tp, unsigned _Idx, size_t _Size> | |
3463 | inline constexpr size_t extent_v<_Tp[_Size], _Idx> = extent_v<_Tp, _Idx - 1>; | |
3464 | template <typename _Tp> | |
3465 | inline constexpr size_t extent_v<_Tp[], 0> = 0; | |
3466 | template <typename _Tp, unsigned _Idx> | |
3467 | inline constexpr size_t extent_v<_Tp[], _Idx> = extent_v<_Tp, _Idx - 1>; | |
3468 | ||
73ae6eb5 | 3469 | #ifdef _GLIBCXX_HAVE_BUILTIN_IS_SAME |
137422c8 | 3470 | template <typename _Tp, typename _Up> |
73ae6eb5 | 3471 | inline constexpr bool is_same_v = __is_same(_Tp, _Up); |
44af818f JW |
3472 | #else |
3473 | template <typename _Tp, typename _Up> | |
7b3587b3 JW |
3474 | inline constexpr bool is_same_v = false; |
3475 | template <typename _Tp> | |
3476 | inline constexpr bool is_same_v<_Tp, _Tp> = true; | |
44af818f | 3477 | #endif |
137422c8 | 3478 | template <typename _Base, typename _Derived> |
cd20d948 | 3479 | inline constexpr bool is_base_of_v = __is_base_of(_Base, _Derived); |
137422c8 | 3480 | template <typename _From, typename _To> |
af85ad89 | 3481 | inline constexpr bool is_convertible_v = __is_convertible(_From, _To); |
6963c3b9 JW |
3482 | template<typename _Fn, typename... _Args> |
3483 | inline constexpr bool is_invocable_v = is_invocable<_Fn, _Args...>::value; | |
3484 | template<typename _Fn, typename... _Args> | |
3485 | inline constexpr bool is_nothrow_invocable_v | |
3486 | = is_nothrow_invocable<_Fn, _Args...>::value; | |
3487 | template<typename _Ret, typename _Fn, typename... _Args> | |
3488 | inline constexpr bool is_invocable_r_v | |
3489 | = is_invocable_r<_Ret, _Fn, _Args...>::value; | |
3490 | template<typename _Ret, typename _Fn, typename... _Args> | |
3491 | inline constexpr bool is_nothrow_invocable_r_v | |
3492 | = is_nothrow_invocable_r<_Ret, _Fn, _Args...>::value; | |
3493 | /// @} | |
083b7f28 | 3494 | #endif // __cpp_lib_type_trait_variable_templates |
873c7d5a | 3495 | |
083b7f28 | 3496 | #ifdef __cpp_lib_has_unique_object_representations // C++ >= 17 && HAS_UNIQ_OBJ_REP |
873c7d5a | 3497 | /// has_unique_object_representations |
aba938d6 | 3498 | /// @since C++17 |
873c7d5a JW |
3499 | template<typename _Tp> |
3500 | struct has_unique_object_representations | |
3501 | : bool_constant<__has_unique_object_representations( | |
3502 | remove_cv_t<remove_all_extents_t<_Tp>> | |
3503 | )> | |
608a080c AP |
3504 | { |
3505 | static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}), | |
3506 | "template argument must be a complete class or an unbounded array"); | |
3507 | }; | |
b0e63d94 | 3508 | |
083b7f28 | 3509 | # if __cpp_lib_type_trait_variable_templates // C++ >= 17 |
6963c3b9 | 3510 | /// @ingroup variable_templates |
b0e63d94 JW |
3511 | template<typename _Tp> |
3512 | inline constexpr bool has_unique_object_representations_v | |
3513 | = has_unique_object_representations<_Tp>::value; | |
083b7f28 | 3514 | # endif |
1f5700e9 | 3515 | #endif |
e2ac6765 | 3516 | |
083b7f28 | 3517 | #ifdef __cpp_lib_is_aggregate // C++ >= 17 && builtin_is_aggregate |
cd20d948 | 3518 | /// is_aggregate - true if the type is an aggregate. |
aba938d6 | 3519 | /// @since C++17 |
e2ac6765 VV |
3520 | template<typename _Tp> |
3521 | struct is_aggregate | |
608a080c | 3522 | : bool_constant<__is_aggregate(remove_cv_t<_Tp>)> |
209ee624 | 3523 | { }; |
e2ac6765 | 3524 | |
083b7f28 | 3525 | # if __cpp_lib_type_trait_variable_templates // C++ >= 17 |
cd20d948 JW |
3526 | /** is_aggregate_v - true if the type is an aggregate. |
3527 | * @ingroup variable_templates | |
3528 | * @since C++17 | |
3529 | */ | |
e2ac6765 | 3530 | template<typename _Tp> |
cd20d948 | 3531 | inline constexpr bool is_aggregate_v = __is_aggregate(remove_cv_t<_Tp>); |
083b7f28 | 3532 | # endif |
e2ac6765 | 3533 | #endif |
aba938d6 JW |
3534 | |
3535 | /** * Remove references and cv-qualifiers. | |
3536 | * @since C++20 | |
3537 | * @{ | |
3538 | */ | |
083b7f28 AA |
3539 | #ifdef __cpp_lib_remove_cvref // C++ >= 20 |
3540 | # if __has_builtin(__remove_cvref) | |
6791489e JW |
3541 | template<typename _Tp> |
3542 | struct remove_cvref | |
6ddbbbff | 3543 | { using type = __remove_cvref(_Tp); }; |
083b7f28 | 3544 | # else |
6ddbbbff JW |
3545 | template<typename _Tp> |
3546 | struct remove_cvref | |
3547 | { using type = typename remove_cv<_Tp>::type; }; | |
0e79e630 JW |
3548 | |
3549 | template<typename _Tp> | |
3550 | struct remove_cvref<_Tp&> | |
6ddbbbff | 3551 | { using type = typename remove_cv<_Tp>::type; }; |
0e79e630 JW |
3552 | |
3553 | template<typename _Tp> | |
3554 | struct remove_cvref<_Tp&&> | |
6ddbbbff | 3555 | { using type = typename remove_cv<_Tp>::type; }; |
083b7f28 | 3556 | # endif |
6791489e JW |
3557 | |
3558 | template<typename _Tp> | |
0e79e630 | 3559 | using remove_cvref_t = typename remove_cvref<_Tp>::type; |
aba938d6 | 3560 | /// @} |
083b7f28 | 3561 | #endif // __cpp_lib_remove_cvref |
6791489e | 3562 | |
083b7f28 | 3563 | #ifdef __cpp_lib_type_identity // C++ >= 20 |
aba938d6 JW |
3564 | /** * Identity metafunction. |
3565 | * @since C++20 | |
3566 | * @{ | |
3567 | */ | |
ee896276 JW |
3568 | template<typename _Tp> |
3569 | struct type_identity { using type = _Tp; }; | |
3570 | ||
3571 | template<typename _Tp> | |
3572 | using type_identity_t = typename type_identity<_Tp>::type; | |
aba938d6 | 3573 | /// @} |
083b7f28 | 3574 | #endif |
ee896276 | 3575 | |
083b7f28 | 3576 | #ifdef __cpp_lib_unwrap_ref // C++ >= 20 |
aba938d6 JW |
3577 | /** Unwrap a reference_wrapper |
3578 | * @since C++20 | |
3579 | * @{ | |
3580 | */ | |
3d18dc9d JW |
3581 | template<typename _Tp> |
3582 | struct unwrap_reference { using type = _Tp; }; | |
3583 | ||
3584 | template<typename _Tp> | |
3585 | struct unwrap_reference<reference_wrapper<_Tp>> { using type = _Tp&; }; | |
3586 | ||
82e8c3da JW |
3587 | template<typename _Tp> |
3588 | using unwrap_reference_t = typename unwrap_reference<_Tp>::type; | |
aba938d6 | 3589 | /// @} |
82e8c3da | 3590 | |
aba938d6 JW |
3591 | /** Decay type and if it's a reference_wrapper, unwrap it |
3592 | * @since C++20 | |
3593 | * @{ | |
3594 | */ | |
3d18dc9d | 3595 | template<typename _Tp> |
82e8c3da | 3596 | struct unwrap_ref_decay { using type = unwrap_reference_t<decay_t<_Tp>>; }; |
3d18dc9d JW |
3597 | |
3598 | template<typename _Tp> | |
3599 | using unwrap_ref_decay_t = typename unwrap_ref_decay<_Tp>::type; | |
aba938d6 | 3600 | /// @} |
083b7f28 | 3601 | #endif // __cpp_lib_unwrap_ref |
3d18dc9d | 3602 | |
083b7f28 | 3603 | #ifdef __cpp_lib_bounded_array_traits // C++ >= 20 |
28d85efb | 3604 | /// True for a type that is an array of known bound. |
0e1b1222 | 3605 | /// @ingroup variable_templates |
aba938d6 | 3606 | /// @since C++20 |
8843cff6 KM |
3607 | # if _GLIBCXX_USE_BUILTIN_TRAIT(__is_bounded_array) |
3608 | template<typename _Tp> | |
3609 | inline constexpr bool is_bounded_array_v = __is_bounded_array(_Tp); | |
3610 | # else | |
28d85efb | 3611 | template<typename _Tp> |
0e1b1222 JW |
3612 | inline constexpr bool is_bounded_array_v = false; |
3613 | ||
3614 | template<typename _Tp, size_t _Size> | |
3615 | inline constexpr bool is_bounded_array_v<_Tp[_Size]> = true; | |
8843cff6 | 3616 | # endif |
28d85efb JW |
3617 | |
3618 | /// True for a type that is an array of unknown bound. | |
0e1b1222 | 3619 | /// @ingroup variable_templates |
aba938d6 | 3620 | /// @since C++20 |
28d85efb | 3621 | template<typename _Tp> |
0e1b1222 | 3622 | inline constexpr bool is_unbounded_array_v = false; |
28d85efb | 3623 | |
0e1b1222 JW |
3624 | template<typename _Tp> |
3625 | inline constexpr bool is_unbounded_array_v<_Tp[]> = true; | |
3626 | ||
3627 | /// True for a type that is an array of known bound. | |
aba938d6 | 3628 | /// @since C++20 |
28d85efb | 3629 | template<typename _Tp> |
0e1b1222 JW |
3630 | struct is_bounded_array |
3631 | : public bool_constant<is_bounded_array_v<_Tp>> | |
3632 | { }; | |
28d85efb | 3633 | |
0e1b1222 | 3634 | /// True for a type that is an array of unknown bound. |
aba938d6 | 3635 | /// @since C++20 |
28d85efb | 3636 | template<typename _Tp> |
0e1b1222 JW |
3637 | struct is_unbounded_array |
3638 | : public bool_constant<is_unbounded_array_v<_Tp>> | |
3639 | { }; | |
083b7f28 | 3640 | #endif // __cpp_lib_bounded_array_traits |
28d85efb | 3641 | |
083b7f28 | 3642 | #if __has_builtin(__is_layout_compatible) && __cplusplus >= 202002L |
037ef219 JW |
3643 | |
3644 | /// @since C++20 | |
3645 | template<typename _Tp, typename _Up> | |
3646 | struct is_layout_compatible | |
3647 | : bool_constant<__is_layout_compatible(_Tp, _Up)> | |
3648 | { }; | |
3649 | ||
3650 | /// @ingroup variable_templates | |
3651 | /// @since C++20 | |
3652 | template<typename _Tp, typename _Up> | |
3653 | constexpr bool is_layout_compatible_v | |
3654 | = __is_layout_compatible(_Tp, _Up); | |
3655 | ||
3656 | #if __has_builtin(__builtin_is_corresponding_member) | |
083b7f28 AA |
3657 | # ifndef __cpp_lib_is_layout_compatible |
3658 | # error "libstdc++ bug: is_corresponding_member and is_layout_compatible are provided but their FTM is not set" | |
3659 | # endif | |
037ef219 JW |
3660 | |
3661 | /// @since C++20 | |
3662 | template<typename _S1, typename _S2, typename _M1, typename _M2> | |
3663 | constexpr bool | |
3664 | is_corresponding_member(_M1 _S1::*__m1, _M2 _S2::*__m2) noexcept | |
3665 | { return __builtin_is_corresponding_member(__m1, __m2); } | |
3666 | #endif | |
3667 | #endif | |
3668 | ||
083b7f28 AA |
3669 | #if __has_builtin(__is_pointer_interconvertible_base_of) \ |
3670 | && __cplusplus >= 202002L | |
4fa6c0ec JW |
3671 | /// True if `_Derived` is standard-layout and has a base class of type `_Base` |
3672 | /// @since C++20 | |
3673 | template<typename _Base, typename _Derived> | |
3674 | struct is_pointer_interconvertible_base_of | |
3675 | : bool_constant<__is_pointer_interconvertible_base_of(_Base, _Derived)> | |
3676 | { }; | |
3677 | ||
3678 | /// @ingroup variable_templates | |
3679 | /// @since C++20 | |
3680 | template<typename _Base, typename _Derived> | |
3681 | constexpr bool is_pointer_interconvertible_base_of_v | |
3682 | = __is_pointer_interconvertible_base_of(_Base, _Derived); | |
3683 | ||
3684 | #if __has_builtin(__builtin_is_pointer_interconvertible_with_class) | |
083b7f28 AA |
3685 | # ifndef __cpp_lib_is_pointer_interconvertible |
3686 | # error "libstdc++ bug: is_pointer_interconvertible available but FTM is not set" | |
3687 | # endif | |
4fa6c0ec JW |
3688 | |
3689 | /// True if `__mp` points to the first member of a standard-layout type | |
3690 | /// @returns true if `s.*__mp` is pointer-interconvertible with `s` | |
3691 | /// @since C++20 | |
3692 | template<typename _Tp, typename _Mem> | |
3693 | constexpr bool | |
3694 | is_pointer_interconvertible_with_class(_Mem _Tp::*__mp) noexcept | |
3695 | { return __builtin_is_pointer_interconvertible_with_class(__mp); } | |
3696 | #endif | |
3697 | #endif | |
3698 | ||
083b7f28 | 3699 | #ifdef __cpp_lib_is_scoped_enum // C++ >= 23 |
aba938d6 | 3700 | /// True if the type is a scoped enumeration type. |
6963c3b9 | 3701 | /// @since C++23 |
6963c3b9 | 3702 | |
4a235f8e KM |
3703 | # if _GLIBCXX_USE_BUILTIN_TRAIT(__is_scoped_enum) |
3704 | template<typename _Tp> | |
3705 | struct is_scoped_enum | |
3706 | : bool_constant<__is_scoped_enum(_Tp)> | |
3707 | { }; | |
3708 | # else | |
b8ecdc77 JW |
3709 | template<typename _Tp> |
3710 | struct is_scoped_enum | |
3711 | : false_type | |
3712 | { }; | |
3713 | ||
43ab1dc2 JW |
3714 | template<typename _Tp> |
3715 | requires __is_enum(_Tp) | |
37ff51a9 | 3716 | && requires(remove_cv_t<_Tp> __t) { __t = __t; } // fails if incomplete |
b8ecdc77 | 3717 | struct is_scoped_enum<_Tp> |
43ab1dc2 JW |
3718 | : bool_constant<!requires(_Tp __t, void(*__f)(int)) { __f(__t); }> |
3719 | { }; | |
4a235f8e | 3720 | # endif |
43ab1dc2 | 3721 | |
aba938d6 JW |
3722 | /// @ingroup variable_templates |
3723 | /// @since C++23 | |
4a235f8e KM |
3724 | # if _GLIBCXX_USE_BUILTIN_TRAIT(__is_scoped_enum) |
3725 | template<typename _Tp> | |
3726 | inline constexpr bool is_scoped_enum_v = __is_scoped_enum(_Tp); | |
3727 | # else | |
b8ecdc77 JW |
3728 | template<typename _Tp> |
3729 | inline constexpr bool is_scoped_enum_v = is_scoped_enum<_Tp>::value; | |
4a235f8e | 3730 | # endif |
083b7f28 | 3731 | #endif |
aba938d6 | 3732 | |
083b7f28 | 3733 | #ifdef __cpp_lib_reference_from_temporary // C++ >= 23 && ref_{converts,constructs}_from_temp |
9a15d3be MP |
3734 | /// True if _Tp is a reference type, a _Up value can be bound to _Tp in |
3735 | /// direct-initialization, and a temporary object would be bound to | |
3736 | /// the reference, false otherwise. | |
3737 | /// @since C++23 | |
3738 | template<typename _Tp, typename _Up> | |
3739 | struct reference_constructs_from_temporary | |
3740 | : public bool_constant<__reference_constructs_from_temporary(_Tp, _Up)> | |
3741 | { | |
3742 | static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}) | |
3743 | && std::__is_complete_or_unbounded(__type_identity<_Up>{}), | |
3744 | "template argument must be a complete class or an unbounded array"); | |
3745 | }; | |
3746 | ||
3747 | /// True if _Tp is a reference type, a _Up value can be bound to _Tp in | |
3748 | /// copy-initialization, and a temporary object would be bound to | |
3749 | /// the reference, false otherwise. | |
3750 | /// @since C++23 | |
3751 | template<typename _Tp, typename _Up> | |
3752 | struct reference_converts_from_temporary | |
3753 | : public bool_constant<__reference_converts_from_temporary(_Tp, _Up)> | |
3754 | { | |
3755 | static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}) | |
3756 | && std::__is_complete_or_unbounded(__type_identity<_Up>{}), | |
3757 | "template argument must be a complete class or an unbounded array"); | |
3758 | }; | |
3759 | ||
3760 | /// @ingroup variable_templates | |
3761 | /// @since C++23 | |
3762 | template<typename _Tp, typename _Up> | |
3763 | inline constexpr bool reference_constructs_from_temporary_v | |
3764 | = reference_constructs_from_temporary<_Tp, _Up>::value; | |
3765 | ||
3766 | /// @ingroup variable_templates | |
3767 | /// @since C++23 | |
3768 | template<typename _Tp, typename _Up> | |
3769 | inline constexpr bool reference_converts_from_temporary_v | |
3770 | = reference_converts_from_temporary<_Tp, _Up>::value; | |
083b7f28 | 3771 | #endif // __cpp_lib_reference_from_temporary |
134a6f7b | 3772 | |
083b7f28 | 3773 | #ifdef __cpp_lib_is_constant_evaluated // C++ >= 20 && HAVE_IS_CONST_EVAL |
6963c3b9 | 3774 | /// Returns true only when called during constant evaluation. |
aba938d6 | 3775 | /// @since C++20 |
0d7924f2 JJ |
3776 | constexpr inline bool |
3777 | is_constant_evaluated() noexcept | |
74d14778 JW |
3778 | { |
3779 | #if __cpp_if_consteval >= 202106L | |
3780 | if consteval { return true; } else { return false; } | |
3781 | #else | |
3782 | return __builtin_is_constant_evaluated(); | |
3783 | #endif | |
3784 | } | |
0d7924f2 JJ |
3785 | #endif |
3786 | ||
083b7f28 | 3787 | #if __cplusplus >= 202002L |
6963c3b9 | 3788 | /// @cond undocumented |
0f8b14ee JW |
3789 | template<typename _From, typename _To> |
3790 | using __copy_cv = typename __match_cv_qualifiers<_From, _To>::__type; | |
3791 | ||
3792 | template<typename _Xp, typename _Yp> | |
3793 | using __cond_res | |
3794 | = decltype(false ? declval<_Xp(&)()>()() : declval<_Yp(&)()>()()); | |
3795 | ||
3796 | template<typename _Ap, typename _Bp, typename = void> | |
3797 | struct __common_ref_impl | |
3798 | { }; | |
3799 | ||
3800 | // [meta.trans.other], COMMON-REF(A, B) | |
3801 | template<typename _Ap, typename _Bp> | |
3802 | using __common_ref = typename __common_ref_impl<_Ap, _Bp>::type; | |
3803 | ||
c37b5ddc JW |
3804 | // COND-RES(COPYCV(X, Y) &, COPYCV(Y, X) &) |
3805 | template<typename _Xp, typename _Yp> | |
3806 | using __condres_cvref | |
3807 | = __cond_res<__copy_cv<_Xp, _Yp>&, __copy_cv<_Yp, _Xp>&>; | |
3808 | ||
0f8b14ee JW |
3809 | // If A and B are both lvalue reference types, ... |
3810 | template<typename _Xp, typename _Yp> | |
c37b5ddc JW |
3811 | struct __common_ref_impl<_Xp&, _Yp&, __void_t<__condres_cvref<_Xp, _Yp>>> |
3812 | : enable_if<is_reference_v<__condres_cvref<_Xp, _Yp>>, | |
3813 | __condres_cvref<_Xp, _Yp>> | |
3814 | { }; | |
0f8b14ee JW |
3815 | |
3816 | // let C be remove_reference_t<COMMON-REF(X&, Y&)>&& | |
3817 | template<typename _Xp, typename _Yp> | |
3818 | using __common_ref_C = remove_reference_t<__common_ref<_Xp&, _Yp&>>&&; | |
3819 | ||
3820 | // If A and B are both rvalue reference types, ... | |
3821 | template<typename _Xp, typename _Yp> | |
3822 | struct __common_ref_impl<_Xp&&, _Yp&&, | |
3823 | _Require<is_convertible<_Xp&&, __common_ref_C<_Xp, _Yp>>, | |
3824 | is_convertible<_Yp&&, __common_ref_C<_Xp, _Yp>>>> | |
3825 | { using type = __common_ref_C<_Xp, _Yp>; }; | |
3826 | ||
3827 | // let D be COMMON-REF(const X&, Y&) | |
3828 | template<typename _Xp, typename _Yp> | |
3829 | using __common_ref_D = __common_ref<const _Xp&, _Yp&>; | |
3830 | ||
3831 | // If A is an rvalue reference and B is an lvalue reference, ... | |
3832 | template<typename _Xp, typename _Yp> | |
3833 | struct __common_ref_impl<_Xp&&, _Yp&, | |
3834 | _Require<is_convertible<_Xp&&, __common_ref_D<_Xp, _Yp>>>> | |
3835 | { using type = __common_ref_D<_Xp, _Yp>; }; | |
3836 | ||
3837 | // If A is an lvalue reference and B is an rvalue reference, ... | |
3838 | template<typename _Xp, typename _Yp> | |
3839 | struct __common_ref_impl<_Xp&, _Yp&&> | |
3840 | : __common_ref_impl<_Yp&&, _Xp&> | |
3841 | { }; | |
6963c3b9 | 3842 | /// @endcond |
0f8b14ee JW |
3843 | |
3844 | template<typename _Tp, typename _Up, | |
3845 | template<typename> class _TQual, template<typename> class _UQual> | |
3846 | struct basic_common_reference | |
3847 | { }; | |
3848 | ||
6963c3b9 | 3849 | /// @cond undocumented |
0f8b14ee JW |
3850 | template<typename _Tp> |
3851 | struct __xref | |
3852 | { template<typename _Up> using __type = __copy_cv<_Tp, _Up>; }; | |
3853 | ||
3854 | template<typename _Tp> | |
3855 | struct __xref<_Tp&> | |
3856 | { template<typename _Up> using __type = __copy_cv<_Tp, _Up>&; }; | |
3857 | ||
3858 | template<typename _Tp> | |
3859 | struct __xref<_Tp&&> | |
3860 | { template<typename _Up> using __type = __copy_cv<_Tp, _Up>&&; }; | |
3861 | ||
3862 | template<typename _Tp1, typename _Tp2> | |
3863 | using __basic_common_ref | |
3864 | = typename basic_common_reference<remove_cvref_t<_Tp1>, | |
3865 | remove_cvref_t<_Tp2>, | |
3866 | __xref<_Tp1>::template __type, | |
3867 | __xref<_Tp2>::template __type>::type; | |
6963c3b9 | 3868 | /// @endcond |
0f8b14ee JW |
3869 | |
3870 | template<typename... _Tp> | |
3871 | struct common_reference; | |
3872 | ||
3873 | template<typename... _Tp> | |
3874 | using common_reference_t = typename common_reference<_Tp...>::type; | |
3875 | ||
3876 | // If sizeof...(T) is zero, there shall be no member type. | |
3877 | template<> | |
3878 | struct common_reference<> | |
3879 | { }; | |
3880 | ||
3881 | // If sizeof...(T) is one ... | |
3882 | template<typename _Tp0> | |
3883 | struct common_reference<_Tp0> | |
3884 | { using type = _Tp0; }; | |
3885 | ||
6963c3b9 | 3886 | /// @cond undocumented |
0f8b14ee JW |
3887 | template<typename _Tp1, typename _Tp2, int _Bullet = 1, typename = void> |
3888 | struct __common_reference_impl | |
3889 | : __common_reference_impl<_Tp1, _Tp2, _Bullet + 1> | |
3890 | { }; | |
3891 | ||
3892 | // If sizeof...(T) is two ... | |
3893 | template<typename _Tp1, typename _Tp2> | |
3894 | struct common_reference<_Tp1, _Tp2> | |
3895 | : __common_reference_impl<_Tp1, _Tp2> | |
3896 | { }; | |
3897 | ||
3898 | // If T1 and T2 are reference types and COMMON-REF(T1, T2) is well-formed, ... | |
3899 | template<typename _Tp1, typename _Tp2> | |
3900 | struct __common_reference_impl<_Tp1&, _Tp2&, 1, | |
3901 | void_t<__common_ref<_Tp1&, _Tp2&>>> | |
3902 | { using type = __common_ref<_Tp1&, _Tp2&>; }; | |
3903 | ||
3904 | template<typename _Tp1, typename _Tp2> | |
3905 | struct __common_reference_impl<_Tp1&&, _Tp2&&, 1, | |
3906 | void_t<__common_ref<_Tp1&&, _Tp2&&>>> | |
3907 | { using type = __common_ref<_Tp1&&, _Tp2&&>; }; | |
3908 | ||
3909 | template<typename _Tp1, typename _Tp2> | |
3910 | struct __common_reference_impl<_Tp1&, _Tp2&&, 1, | |
3911 | void_t<__common_ref<_Tp1&, _Tp2&&>>> | |
3912 | { using type = __common_ref<_Tp1&, _Tp2&&>; }; | |
3913 | ||
3914 | template<typename _Tp1, typename _Tp2> | |
3915 | struct __common_reference_impl<_Tp1&&, _Tp2&, 1, | |
3916 | void_t<__common_ref<_Tp1&&, _Tp2&>>> | |
3917 | { using type = __common_ref<_Tp1&&, _Tp2&>; }; | |
3918 | ||
3919 | // Otherwise, if basic_common_reference<...>::type is well-formed, ... | |
3920 | template<typename _Tp1, typename _Tp2> | |
3921 | struct __common_reference_impl<_Tp1, _Tp2, 2, | |
3922 | void_t<__basic_common_ref<_Tp1, _Tp2>>> | |
3923 | { using type = __basic_common_ref<_Tp1, _Tp2>; }; | |
3924 | ||
3925 | // Otherwise, if COND-RES(T1, T2) is well-formed, ... | |
3926 | template<typename _Tp1, typename _Tp2> | |
3927 | struct __common_reference_impl<_Tp1, _Tp2, 3, | |
3928 | void_t<__cond_res<_Tp1, _Tp2>>> | |
3929 | { using type = __cond_res<_Tp1, _Tp2>; }; | |
3930 | ||
3931 | // Otherwise, if common_type_t<T1, T2> is well-formed, ... | |
3932 | template<typename _Tp1, typename _Tp2> | |
3933 | struct __common_reference_impl<_Tp1, _Tp2, 4, | |
3934 | void_t<common_type_t<_Tp1, _Tp2>>> | |
3935 | { using type = common_type_t<_Tp1, _Tp2>; }; | |
3936 | ||
3937 | // Otherwise, there shall be no member type. | |
3938 | template<typename _Tp1, typename _Tp2> | |
3939 | struct __common_reference_impl<_Tp1, _Tp2, 5, void> | |
3940 | { }; | |
3941 | ||
3942 | // Otherwise, if sizeof...(T) is greater than two, ... | |
3943 | template<typename _Tp1, typename _Tp2, typename... _Rest> | |
3944 | struct common_reference<_Tp1, _Tp2, _Rest...> | |
3945 | : __common_type_fold<common_reference<_Tp1, _Tp2>, | |
3946 | __common_type_pack<_Rest...>> | |
3947 | { }; | |
3948 | ||
3949 | // Reuse __common_type_fold for common_reference<T1, T2, Rest...> | |
3950 | template<typename _Tp1, typename _Tp2, typename... _Rest> | |
3951 | struct __common_type_fold<common_reference<_Tp1, _Tp2>, | |
3952 | __common_type_pack<_Rest...>, | |
3953 | void_t<common_reference_t<_Tp1, _Tp2>>> | |
3954 | : public common_reference<common_reference_t<_Tp1, _Tp2>, _Rest...> | |
3955 | { }; | |
6963c3b9 | 3956 | /// @endcond |
0f8b14ee | 3957 | |
e641ee43 JW |
3958 | #endif // C++2a |
3959 | ||
6963c3b9 JW |
3960 | /// @} group metaprogramming |
3961 | ||
12ffa228 | 3962 | _GLIBCXX_END_NAMESPACE_VERSION |
c0ffa2ba | 3963 | } // namespace std |
7b50cdef | 3964 | |
734f5023 | 3965 | #endif // C++11 |
57317d2a | 3966 | |
7274deff | 3967 | #endif // _GLIBCXX_TYPE_TRAITS |